Method and apparatus for resource determination, resource configuration, transmitting random access preamble and random access

ABSTRACT

The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-Generation (4G) communication system such as long term evolution (LTE). The method for operating a terminal in a wireless communication system is provided. The method includes receiving, from a base station, configuration information of an initial active uplink bandwidth part (UL BWP) and corresponding random access resource; based on the configuration information of the initial active UL BWP and the corresponding random access resource, determining corresponding physical random access channel (PRACH) occasions; and performing random access procedure based on the determined PRACH occasion.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of application Ser. No. 16/719,864,filed on Dec. 18, 2019, which is a continuation of InternationalApplication No. PCT/KR2018/010463, filed on Sep. 7, 2018, which claimspriority to Chinese Patent Application No. 201710807829.6 filed on Sep.8, 2017, Chinese Patent Application No. 201710813778.8 filed on Sep. 11,2017, Chinese Patent Application No. 201711140825.3 filed on Nov. 16,2017 and Chinese Patent Application No. 201711158524.3 filed on Nov. 20,2017, the disclosures of which are herein incorporated by reference intheir entirety.

BACKGROUND 1. Field

The disclosure generally relates to the wireless communication system.More specifically, this disclosure relates to a method and apparatus fora resource determination, a resource configuration and a random access.

2. Description of Related Art

To meet the demand for wireless data traffic having increased sincedeployment of 4th generation (4G) communication systems, efforts havebeen made to develop an improved 5th generation (5G) or pre-5Gcommunication system. Therefore, the 5G or pre-5G communication systemis also called a ‘Beyond 4G Network’ or a ‘Post Long Term Evolution(LTE) System’.

The 5G communication system is considered to be implemented in higherfrequency (mmWave) bands, e.g., 28 GHz or 60 GHz bands, so as toaccomplish higher data rates. To decrease propagation loss of the radiowaves and increase the transmission distance, the beamforming, massivemultiple-input multiple-output (MIMO), Full Dimensional MIMO (FD-MIMO),array antenna, an analog beam forming, large scale antenna techniquesare discussed in 5G communication systems.

In addition, in 5G communication systems, development for system networkimprovement is under way based on advanced small cells, cloud RadioAccess Networks (RANs), ultra-dense networks, device-to-device (D2D)communication, wireless backhaul, moving network, cooperativecommunication, Coordinated Multi-Points (CoMP), reception-endinterference cancellation and the like.

In the 5G system, Hybrid frequency shift keying (FSK) and quadratureamplitude modulation (FQAM) and sliding window superposition coding(SWSC) as an advanced coding modulation (ACM), and filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA), and sparse codemultiple access (SCMA) as an advanced access technology have beendeveloped.

The rapid development of information industry, particularly theincreasing demand from the mobile Internet and the Internet of Things(IoT), brings about unprecedented challenges in the future mobilecommunications technology. According to the ITU-R M. [IMT. BEYOND 2020.TRAFFIC] issued by the International Telecommunication Union (ITU), itcan be expected that, by 2020, mobile services traffic will grow nearly1,000 times as compared with that in 2010 (4G era), and the number ofuser device connections will also be over 17 billion, and with a vastnumber of IoT devices gradually expand into the mobile communicationnetwork, the number of connected devices will be even more astonishing.In response to this unprecedented challenge, the communications industryand academia have prepared for 2020s by launching an extensive study ofthe fifth-generation mobile communications technology (5G). Currently,in ITU-R M. [IMT. VISION] from ITU, the framework and overall objectivesof the future 5G have been discussed, where the demands outlook,application scenarios and various important performance indexes of 5Ghave been described in detail. In terms of new demands in 5G, the ITU-RM. [IMT. FUTURE TECHNOLOGY TRENDS] from ITU provides information relatedto the 5G technology trends, which is intended to address prominentissues such as significant improvement on system throughput, consistencyof the user experience, scalability to support IoT, time delay, energyefficiency, cost, network flexibility, support for emerging services andflexible spectrum utilization, etc.

The performance of random access directly influences the user'sexperience. In a conventional radio communication system, for example,in LTE and LTE-Advanced, the random access process has been applied invarious scenarios, such as, establishing an initial link, cell handover,reestablishing an uplink link, reestablishing an RRC connection or more;moreover, in accordance with whether a subscriber exclusively occupiespreamble sequence resources, the random access process is classifiedinto: contention-based random access and contention-free random access.Since, for the contention-based random access, each user equipmentselects a preamble sequence from same preamble sequence resources whentrying to establish an uplink, there may be a case in which multipleuser equipment's select and transmit a same preamble sequence to anetwork equipment. Therefore, the collision resolution mechanism becomesan important research direction in the random access. How to reduce thecollision probability and how to quickly solve a collision that hasoccurred are key indicators influencing the random access performance.

The contention-based random access process in LTE-A includes four steps,as shown in FIG. 5. In the first step, the user equipment (UE) randomlyselects one preamble sequence from a preamble sequence resource pool andtransmits the selected preamble sequence to the network equipment; andthe network equipment performs correlation detection on the receivedsignal to identify the preamble sequence transmitted by the UE. In thesecond step, the network equipment transmits a Random Access Response(RAR) to the UE, the RAR containing a random access preamble sequenceidentifier, a timing advance instruction determined according to aestimation of a time delay between the UE and the network equipment, aTemporary Cell-Radio Network Temporary Identifier (TC-RNTI), andtime-frequency resources allocated for the UE to perform uplinktransmission next time. In the third step, the UE transmits a Message 3(MSg3) to the network equipment according to information in the RAR, theMSg3 containing information such as a UE t identifier and an RRC linkrequest, wherein the UE identifier is an identifier that is unique to auser and used for resolving collision. In the fourth step, the networkequipment transmits a collision resolution identifier to the UE, thecollision resolution identifier containing an identifier correspondingto a UE who wins in the collision resolution. The UE upgrades TC-RNTI toCell-Radio Network Temporary Identifier (C-RNTI) upon detecting its ownidentifier and transmits an Acknowledgement (ACK) signal to the networkequipment to complete the random access process and wait for thescheduling of the base station. Otherwise, the UE will start a newrandom access process after a certain delay.

For a contention-free random access process, since the network equipmenthas already known the identifier of the UE, it can allocate a preamblesequence to the UE. Thus, when transmitting a preamble sequence, the UEdoes not need to randomly select a sequence, and instead, it will usethe allocated preamble sequence. Upon detecting the allocated preamblesequence, the network equipment will transmit a corresponding RAR, theRAR including information such as timing advance and uplink resourceallocation. Upon receiving the RAR, the UE considers that the uplinksynchronization has been completed, and waits for the further schedulingof the network equipment. Therefore, the contention-free random accessprocess contains only two steps: a first step of transmitting a preamblesequence, and a second step of transmitting an RAR.

The random access process in LTE is applicable for the followingscenarios:

1. initial access under RRC_IDLE;

2. reestablishment of RRC connection;

3. cell handover;

4. in an RRC connected state, the downlink data arrives and a randomaccess process is requested (when the uplink is nonsynchronous);

5. in an RRC connected state, the uplink data arrives and a randomaccess process is requested (when the uplink is nonsynchronous or nosource is allocated for a scheduling request in a PUCCH resource); and

6. positioning.

In the LTE, the above six scenarios use the same random access steps.

Before the random access process, a UE needs to determine availablerandom access resources; however, in a new communication system, thebandwidth is divided into one or more different Bandwidth Parts (BWPs).Therefore, how a UE determines an available random access resource forrandom access becomes a problem for those skilled in the art.

With the rapid development of information industry, especially theincreasing demand from mobile internet and internet of things (IOT), itwill bring unprecedented challenges to the future mobile communicationtechnology. For example, compared with the 4G era in 2010, according tothe ITU-R M. [IMT.BEYOND 2020.TRAFFIC] report of the internationaltelecommunication union (ITU), it can be anticipated that by 2020, theamount of mobile services will increase by nearly 1,000 more than the 4Gera in 2010, and the number of user equipment connections will alsoexceed 17 billion. As massive IOT devices gradually penetrate into themobile communication network, the number of connected devices will bemore astonishing. In order to meet this unprecedented challenge, thecommunication industry and academia have conducted extensive research onthe fifth generation mobile communication technology (5G), which isoriented to the 2020s. At present, the framework and overall objectivesof 5G in the ITU-R M. [IMT.VISION] report of the ITU have beendiscussed, in which the requirements outlook, application scenarios andvarious important performance indicators of 5G are described in detail.In view of the new requirements in 5G, the ITU-R M. [IMT.FUTURETECHNOLOGY TRENDS] report of the ITU provides information about 5G'stechnical trends, aiming at solving the obvious problems of significantimprovement of system throughput, consistency of user experience,scalability to support IOT time delay, energy efficiency, cost, networkflexibility, support of emerging services and flexible spectrumutilization.

Compared with the existing LTE system, the system operated in highfrequency band will be introduced into 5G so as to improve the datatransmitting efficiency and spectrum utilization rate of the system. Inorder to compensate significant path loss in high-band wirelesschannels, wireless communication systems operated in high-band need toadopt multi-beam operation, and the performance of the system can beimproved by the beamforming gain generated by correct beam pairing.Therefore, for multi-beam systems, the accuracy of beam pairing willsignificantly affect the system performance.

For multi-beam operating system operated in high frequency band, thebeam selection of initial access needs to be completed by searching forsynchronization signal blocks. Specifically, there are multiplesynchronization signal blocks in the system, and each synchronizationsignal block uses the same or different downlink transmit beams totransmit downlink signals. The terminal selects the appropriatesynchronization signal block according to the reference signal receivedpower (RSRP) of the synchronization signal block by adopting a presetcriteria, and completes the downlink synchronization process.

Considering that in a 5G system, a downlink beam covers only a part ofangles in a sector, the coverage requirements may be different indifferent downlink beam coverage areas, and the workload may also bedifferent, so the required downlink transmit power may also bedifferent. When different synchronization signal blocks use differenttransmit powers, it is necessary to inform the correspondingsynchronization signal block of the corresponding transmit power in thesystem information, so that the terminal can compute the path loss, thusacquire the power for transmitting the random access preamble. Theinforming of each synchronization signal block of the correspondingtransmitting in the system information will costa larger overhead.

How to inform the transmit power of random access preamble with a lessoverhead is an urgent problem to be solved in the prior art.

In the prior art, the terminal computes the path loss according to thepreset base station transmit power and the measured reference signalreceiving power, and determines the transmit power of the random accesspreamble. For a multi-beam operating system in 5G, because the coveragerequirements in different beam coverage areas are different, even fordifferent beam coverage areas in the same sector, the transmit powerrequirements of downlink synchronization signal blocks are different. Atthis time, still using a single downlink transmit power will not meetthe power transmitting requirements in different beam coverage areas inthe cell, resulting in power waste.

In LTE, the above six scenarios use the same random access steps. Infuture communication systems, the base station may still successfullydecode multiple users (i.e., successfully receives the Msg3 of themultiple users) when the transmission of Msg3 of multiple userscollides, due to the using of beamforming systems or other reasons. Inthe traditional LTE communication system, the base station will transmita contention resolution message for only one user; while in the newsystem, if the base station can already have decoded multiple users,that is, it has the ability to enable multiple users access to thesystem, there should have the technology to support to avoid limitingaccess to only one user by transmitting a contention resolution messagefor only one user; in particular, the using of beamforming systems willincrease the probability of decoding multiple conflicting Msg3 s, itneed more effectively enable the user to complete the random access.

SUMMARY

Embodiments of the present disclosure provide a method and an apparatusfor a resource determination, a resource configuration and a randomaccess.

Embodiments of the present disclosure provide a method and an apparatusto solve at least one of the above technical detects, particularly thetechnical defect that it is unable to realize random access.

In one embodiment, a resource determination method is provided. Theresource determination method includes steps of:

acquiring configuration information of an initial active uplinkbandwidth part (UL BWP) and corresponding random access resourceconfiguration information;

based on the configuration information of the initial active UL BWP andthe configuration information of the random access resource, determiningthe corresponding PRACH occasions; and

performing random access procedure based on the determined PRACHoccasions.

In another embodiment, a resource configuration method is provided. Theresource configuration method includes steps of:

configuring an initial active UL BWP and a corresponding random accessresource; and

transmitting, to a User Equipment (UE), configuration information of theinitial active UL BWP and the corresponding random access resourceconfiguration information for the UE to perform random access procedure.

In yet another embodiment, a network equipment is provided. The networkequipment includes:

a configuring module configured to configure an initial active UL BWPand a corresponding random access resource; and

a transmitting module configured to transmit, to a UE, configurationinformation of the initial active UL BWP and the corresponding randomaccess resource configuration information for the UE to perform randomaccess procedure.

In yet another embodiment a user equipment is provided. The userequipment includes:

an acquiring module configured to acquire configuration information ofan initial active UL BWP and corresponding random access resourceconfiguration information;

a determining module configured to determine, based on the configurationinformation of the initial active UL BWP and the configurationinformation of the random access resource, the corresponding PRACHoccasions; and

an access module configured to perform random access procedure based onthe determined PRACH occasions.

In yet another embodiment, a network equipment is provided. The networkequipment includes:

a processor; and

a memory configured to store machine-readable instructions which, whenexecuted by the processor, enable the processor to execute the resourceconfiguration method described above.

In yet another embodiment, a user equipment is provided. The userequipment includes:

a processor; and

a memory configured to store machine-readable instructions which, whenexecuted by the processor, enable the processor to execute the resourcedetermination method described above.

In yet another embodiment, a method for transmitting a random accesspreamble is provided. The method comprises:

detecting a synchronization signal block to obtain a reference signalreceiving power;

determining a target synchronization signal block according to thereference signal receiving power, and acquiring configurationinformation carried in the target synchronization signal block;

determining a random access channel and a random access preambleaccording to the configuration information, and determining the transmitpower of the random access preamble according to the configurationinformation and the reference signal receiving power; and

transmitting the random access preamble on the random access channelaccording to the transmit power.

Preferably, the step of determining a target synchronization signalblock according to the reference signal receiving power comprises:

selecting a synchronization signal block corresponding to the referencesignal receiving power with the largest value among the reference signalreceiving powers as a target synchronization signal block; or,

selecting synchronization signal blocks corresponding to multiplereference signal receiving powers higher than a first preset thresholdamong the reference signal receiving powers, and randomly selecting onesynchronization signal block as a target synchronization signal blockwith an the same probability among the selected synchronization signalblocks; selecting a synchronization signal block corresponding to thereference signal receiving power with the largest value as a targetsynchronization signal block, if there is no reference signal receivingpower higher than the first preset threshold in the reference signalreceiving powers.

Preferably, the step of determining a target synchronization signalblock according to the reference signal receiving power comprises:

computing the path loss of each synchronization signal block accordingto each of the reference signal receiving powers and the transmit powerindicated in the configuration information carried in the correspondingsynchronization signal block, and selecting the target synchronizationsignal block according to the path loss.

Preferably, the step of selecting the target synchronization signalblock according to the path loss comprises:

selecting the synchronization signal block with the smallest path lossas the target synchronization signal block; or,

selecting synchronization signal blocks corresponding to multiple pathlosses lower than a second preset threshold among the path losses, andrandomly selecting one synchronization signal block as a targetsynchronization signal block with the same probability among theselected synchronization signal blocks; and selecting thesynchronization signal block with the smallest path loss as the targetsynchronization signal block, if there is no path loss lower than thesecond preset threshold among the path losses.

Preferably, the configuration information is power configurationinformation, and the step of determining the transmit power of therandom access preamble according to the configuration information andthe reference signal receiving power comprises:

determining the transmit power of the target synchronization signalblock according to the power configuration information;

computing the path loss of the target synchronization signal blockaccording to the transmit power of the target synchronization signalblock and the reference signal receiving power; and

computing to obtain the transmit power of the random access preambleaccording to the power configuration information and the path loss ofthe target synchronization signal block.

Preferably, the step of determining the transmit power according to thepower configuration information comprises any one of the following ways:

acquiring the transmit power of the target synchronization signal block;and

determining the transmit power according to a reference transmit powerand power fluctuation parameters.

Preferably, the step of acquiring the transmit power of the targetsynchronization signal block comprises:

acquiring quantized transmit powers carried in the power configurationinformation; or,

acquiring first index information of the target synchronization signalblock carried in the power configuration information; and checking atransmit power mapping list according to first index information, andacquiring the transmit power corresponding to the first indexinformation.

Preferably, the step of acquiring the transmit power of the targetsynchronization signal block comprises:

acquiring a power configuration parameter sequence contained in thepower configuration information; wherein the power configurationparameter sequence is a sequence composed of transmit power informationcorresponding to each synchronization signal block group in the currentpower group; and determining the transmit power according to the indexinformation of the target synchronization signal block and the powerconfiguration parameter sequence.

Preferably, the step of acquiring the transmit power of the targetsynchronization signal block comprises:

acquiring number of power groups contained in the power configurationinformation, synchronization signal block index information in eachpower group, a synchronization signal block index sequence and transmitpower configuration information corresponding to each power group;wherein one power group consists of multiple synchronization signalblocks, and the transmit power configuration information of allsynchronization signal blocks in each power group is the same; thesynchronization signal block index sequence is a sequence composed ofindex information of multiple synchronization signal blocks with thesame transmit power;

selecting a power group matched with the target synchronization signalblock according to the index information of the target synchronizationsignal block, the synchronization signal block index information in eachpower group and the synchronization signal block index sequence; and

determining the transmit power according to the transmit powerconfiguration information corresponding to the selected power group.

Preferably, if number of synchronization signal blocks in each powergroup is different, the power configuration information further includesthe number of synchronization signal blocks in each power group.

Preferably, the step of acquiring the transmit power of the targetsynchronization signal block comprises:

acquiring number of power groups contained in the power configurationinformation, index information of synchronization signal block groups ineach power group and transmit power configuration informationcorresponding to each synchronization signal block group in each powergroup; wherein one power group consists of multiple synchronizationsignal block groups, and the transmit power configuration information ofall synchronization signal blocks in each synchronization signal blockgroup of each power group is the same; and

selecting synchronization signal block groups in the power groupsmatched with the target synchronization signal block according to theindex information of the target synchronization signal block and thesynchronization signal block group index information in each powergroup; and

determining the transmit power according to the transmit powerconfiguration information corresponding to the selected synchronizationsignal block group.

Preferably, the step of acquiring the transmit power of the targetsynchronization signal block comprises:

acquiring transmit power configuration information corresponding to apower group contained in the power configuration information; whereinone power group consists of multiple synchronization signal blockgroups, and the transmit power configuration information of allsynchronization signal blocks in each synchronization signal block groupof each power group is the same; and

determining the transmit power configuration information correspondingto the power group as the transmit power of the target synchronizationinformation block.

Preferably, the step of determining the transmit power according to areference transmit power and power fluctuation parameters comprises:

acquiring a quantized reference transmit power and second indexinformation carried in the power configuration information;

checking a power fluctuation parameter mapping list according to thesecond index information, and acquiring the power fluctuation parameterscorresponding to the second index information; and

computing and acquiring the transmit power of the target synchronizationsignal block according to the quantized reference transmit power and thepower fluctuation parameters.

Preferably, the step of determining the transmit power according to areference transmit power and power fluctuation parameters comprises:

acquiring a quantized reference emission power and quantized powerfluctuation parameters carried in the power configuration information;and

computing and acquiring the transmit power of the target synchronizationsignal block according to the quantized reference transmit power and thequantized power fluctuation parameters.

Preferably, the step of determining the transmit power according to areference transmit power and power fluctuation parameters comprises:

acquiring second index information of the target synchronization signalblock carried in the power configuration information;

checking a power fluctuation parameter mapping list according to thesecond index information, and acquiring the power fluctuation parameterscorresponding to the second index information; and

computing and acquiring the transmit power of the target synchronizationsignal block according to the preset reference transmit power and thepower fluctuation parameters.

Preferably, the step of determining the transmit power according to areference transmit power and power fluctuation parameters comprises:

acquiring preconfigured power fluctuation parameters and third indexinformation carried in the power configuration information;

checking a reference transmit power mapping list according to the thirdindex information, and acquiring the reference transmit powercorresponding to the third index information; and

computing and acquiring the transmit power of the target synchronizationsignal block according to the reference transmit power and the powerfluctuation parameters.

Preferably, the step of determining the transmit power according to areference transmit power and power fluctuation parameters comprises:

acquiring second index information and third index information carriedin the power configuration information;

checking a power fluctuation parameter mapping list according to thesecond index information, and acquiring the power fluctuation parameterscorresponding to the second index information; and

checking a reference transmit power mapping list according to the thirdindex information, and acquiring the reference transmit powercorresponding to the third index information; and

computing and acquiring the transmit power of the target synchronizationsignal block according to the reference transmit power and the powerfluctuation parameters.

Preferably, the step of computing to obtain the transmit power of therandom access preamble according to the power configuration informationand the path loss of the target synchronization signal block comprises:

acquiring initial target preamble receiving power information in thepower configuration information;

computing a target receiving power of a preamble according to theinitial target preamble receiving power information; and

computing to obtain the transmit power of the random access preambleaccording to the target receiving power and the path loss of thepreamble.

Preferably, it also includes:

acquiring power control parameters carried in the power configurationinformation; and

adjusting the preamble target receiving power or the transmit power ofthe random access preamble according to the power control parameters.

Preferably, the step of acquiring power control parameters carried inthe power configuration information comprises:

acquiring power control parameters of the target synchronization signalblock carried in the power configuration information; or,

acquiring fourth index information of the target synchronization signalblock carried in the power configuration information; and checking apower control parameter mapping list according to the fourth indexinformation, and acquiring the power control parameters corresponding tothe fourth index information.

In yet another embodiment, an apparatus for transmitting a random accesspreamble is provided. The apparatus comprises:

a detection unit configured to detect a synchronization signal block toobtain a reference signal receiving power;

a first processing unit configured to determine a target synchronizationsignal block according to the reference signal receiving power, andacquire configuration information carried in the target synchronizationsignal block;

a second processing unit configured to determine a random access channeland a random access preamble according to the configuration information,and determine the transmit power of the random access preamble accordingto the configuration information and the reference signal receivingpower; and

a transmit unit configured to transmit the random access preamble on therandom access channel according to the transmit power.

In yet another embodiment, a random access method is provided. Themethod comprises:

transmitting random access response(s) (RAR(s)) to a plurality of UEs,based on received preambles transmitted by the plurality of UEs;

receiving Msg3(s) transmitted by the plurality of UEs; and

transmitting a contention resolution message to the plurality of UEs,based on the received Msg3(s) transmitted by the plurality of UEs.

In yet another embodiment, another random access method is provided. Themethod comprises:

transmitting a Msg3 to a base station, based on received Random AccessResponse (RAR) corresponding to a transmitted preamble;

receiving a contention resolution message from the base stationcorresponding to the Msg3.

In yet another embodiment, a base station device is provided. The basestation comprises:

a first transmitting module, configured to transmit random accessresponse(s) (RAR(s)) to a plurality of UEs, based on the receivedpreambles transmitted by the plurality of UEs;

a first receiving module, configured to receive Msg3(s) transmitted bythe plurality of UEs; and

a second transmitting module, configured to transmit a contentionresolution message to the plurality of UEs based on the received Msg3transmitted by the plurality of UEs.

In yet another embodiment, a user equipment is provided. The userequipment comprises:

a third transmitting module, configured to transmit a Msg3 to a basestation based on received random access response corresponding to atransmitted preamble;

a second receiving module, configured to receive a contention resolutionmessage from the base station corresponding to the Msg3.

In yet another embodiment, a method for operating a terminal in awireless communication system is provided. The method includesreceiving, from a base station, configuration information of an initialactive uplink bandwidth part (UL BWP) and corresponding random accessresource; based on the configuration information of the initial activeUL BWP and the corresponding random access resource, determiningcorresponding physical random access channel (PRACH) occasions; andperforming random access procedure based on the determined PRACHoccasion.

In yet another embodiment, a method for operating a base station in awireless communication system is provided. The method includesconfiguring an initial active uplink bandwidth part (UL BWP) and acorresponding random access resource; and transmitting, to a terminal,configuration information of the initial active UL BWP and thecorresponding random access resource for the UE to perform random accessprocedure, wherein the configuration information of the initial activeUL BWP and the corresponding random access resource is used to determinecorresponding physical random access channel (PRACH) occasions.

In yet another embodiment, a method for operating a terminal in awireless communication system is provided. The method includes detectinga synchronization signal block to obtain a reference signal receivingpower; determining a target synchronization signal block according tothe reference signal receiving power, and acquiring configurationinformation carried in the target synchronization signal block;determining a random access channel and a random access preambleaccording to the configuration information, and determining the transmitpower of the random access preamble according to the configurationinformation and the reference signal receiving power; and transmitting,to a base station, the random access preamble on the random accesschannel according to the transmit power.

A method and an apparatus according to various embodiments of thepresent disclosure describe that in the resource determination methodprovided by the embodiments of the present disclosure, configurationinformation of an initial active UL BWP and corresponding random accessresource configuration information are acquired, so that a prerequisiteis provided for the subsequent determination of a corresponding PRACHfor initial access based on the configuration information; and then, thecorresponding PRACH occasions are determined based on the configurationinformation of the initial active UL BWP and the configurationinformation of the random access resource, so that a UE can find theposition of the available PRACH occasion and then perform random accessprocedure based on the determined PRACH occasions. Accordingly, the UEcan perform random access procedure based on the PRACH occasions so asto access to the network.

A method and an apparatus according to various embodiments of thepresent disclosure describe that in the resource configuration methodprovided by the embodiments of the present disclosure, an initial activeUL BWP and a corresponding random access resource are configured, sothat a prerequisite is provided for the subsequent transmission ofconfiguration information of the initial active UL BWP and thecorresponding random access resource to a UE; and then, configurationinformation of the initial active UL BWP and the corresponding randomaccess resource are transmitted to the UE for the UE to perform randomaccess procedure, so that information about a BWP used by initial accessand the position information of a random access resource are informed tothe user equipment. Accordingly, during the random access, the userequipment can timely acquire the configuration condition of the initialactive UL BWP and the corresponding random access resource and thusaccess the network.

A method and an apparatus according to various embodiments of thepresent disclosure describe that compared with the prior art, thedisclosure at least has the following advantages:

In the disclosure, by configuring the transmit power of thesynchronization signal block and the preamble target receiving power,different of random access preamble transmit powers are configured fordifferent synchronization signal blocks with a lower of overhead. Byadopting the method provided by the disclosure, higher energy efficiencycan be provided for the system, at the same time, the power of theterminal can be saved, the service life of the terminal can beprolonged, and the user experience can be improved.

The embodiment of the present disclosure provides a random accessmethod. The random access method comprises: transmitting of randomaccess response(s) (RAR(s)) to a plurality of UEs, based on receivedpreambles transmitted by the plurality of UEs; receiving of Msg3(s)transmitted by the plurality of UEs, which provides necessary guaranteesfor subsequent transmitting of a contention resolution message to theplurality of UEs; and transmitting of a contention resolution message tothe plurality of UEs, based on the Msg3 transmitted by the plurality ofUEs. The method can enable the base station to transmit the contentionresolution message to the plurality of different UEs at the same time.It provides a reliable guarantee for multiple users to access the basestation and perform data transmission at the same time based on thereceived contention resolution message, and effectively avoids thesituation that the base station transmits the contention resolutionmessage to only one user and only one user is accessed thereto.

Additional aspects and advantages of the present disclosure will be setforth in part in the below description and become apparent from thedescription, or may be learned by practice of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of this disclosure and its advantages,reference is now made to the following description, taken in conjunctionwith the accompanying drawings, in which:

FIG. 1 illustrates a wireless communication system according to variousembodiments of the present disclosure;

FIG. 2 illustrates the BS in the wireless communication system accordingto various embodiments of the present disclosure;

FIG. 3 illustrates the terminal in the wireless communication systemaccording to various embodiments of the present disclosure;

FIG. 4 illustrates the communication interface in the wirelesscommunication system according to various embodiments of the presentdisclosure;

FIG. 5 illustrates a schematic flowchart of the conventionalcontention-based random access according to various embodiments of thepresent disclosure;

FIG. 6 illustrates a schematic flowchart of a resource configurationmethod according to various embodiments of the present disclosure;

FIG. 7 illustrates a schematic diagram of indicating an initial activeUL BWP and continuously arranged PRACHs according to various embodimentsof the present disclosure;

FIG. 8 illustrates a schematic flowchart of a resource determinationmethod according to various embodiments of the present disclosure;

FIG. 9 illustrates a first exemplary diagram of confirmation of afrequency-domain position of an PRACH according to various embodimentsof the present disclosure;

FIG. 10 illustrates a second exemplary diagram of confirmation of afrequency-domain position of an PRACH according to various embodimentsof the present disclosure;

FIG. 11 illustrates a third exemplary diagram of confirmation of afrequency-domain position of an PRACH according to various embodimentsof the present disclosure;

FIG. 12 illustrates a fourth exemplary diagram of confirmation of afrequency-domain position of an PRACH according to various embodimentsof the present disclosure;

FIG. 13 illustrates a first exemplary diagram of confirmation of afrequency-domain position of a beam failure recovery request resourceaccording to various embodiments of the present disclosure;

FIG. 14 illustrates a second exemplary diagram of confirmation of afrequency-domain position of a beam failure recovery request resourceaccording to various embodiments of the present disclosure;

FIG. 15 illustrates a third exemplary diagram of confirmation of afrequency-domain position of a beam failure recovery request resourceaccording to various embodiments of the present disclosure;

FIG. 16 illustrates a schematic diagram of a basic structure of aterminal equipment according to various embodiments of the presentdisclosure;

FIG. 17 illustrates a schematic diagram of a basic structure of anetwork equipment according to various embodiments of the presentdisclosure; and

FIG. 18 illustrates a block diagram of a computing system forimplementing the network equipment or user equipment according tovarious embodiments of the present disclosure.

FIG. 19 illustrates a schematic flowchart of a method for configuring atransmit power of a random access preamble according to variousembodiments of the present disclosure;

FIG. 20 illustrates a schematic flowchart of a method for transmitting arandom access preamble according to various embodiments of the presentdisclosure;

FIG. 21 illustrates a schematic diagram of transmitting asynchronization signal block according to various embodiments of thepresent disclosure;

FIG. 22 illustrates a schematic diagram of power configuration in asynchronization signal block group according to various embodiments ofthe present disclosure;

FIG. 23 illustrates a schematic flowchart of a method for transmitting arandom access preamble according to various embodiments of the presentdisclosure;

FIG. 24 illustrates a structural diagram of an apparatus fortransmitting a random access preamble according to various embodimentsof the present disclosure.

FIG. 25 illustrates a schematic flowchart of a traditionalcontention-based random access;

FIG. 26 illustrates a schematic flowchart of a random access methodaccording to Embodiment 6 of the present disclosure;

FIG. 27 illustrates an exemplary diagram of extending an existing UEcontention resolution identity MAC CE according to Embodiment 6 of thepresent disclosure;

FIG. 28 illustrates an exemplary diagram of adding a separate MAC CEindication according to Embodiment 6 of the present disclosure;

FIG. 29 illustrates a schematic flowchart of a random access methodaccording to Embodiment 7 of the present disclosure;

FIG. 30 illustrates an exemplary diagram of UE reading contentionresolution identity MAC CE according to Embodiment 7 of the presentdisclosure;

FIG. 31 illustrates an exemplary diagram of UE reading (a plurality of)contention resolution identity MAC CEs according to Embodiment 7 of thepresent disclosure;

FIG. 32 illustrates an exemplary diagram of UEs respectively reading thecontention resolution identity MAC CE and MAC CE of the allocated C-RNTIand the HARQ feedback resource indication according to Embodiment 7 ofthe present disclosure;

FIG. 33 illustrates an exemplary diagram of UE reading (a plurality of)contention resolution identity MAC CEs and (a plurality of) MAC CEs ofthe allocated C-RNTI and HARQ feedback resource indication respectivelyaccording to Embodiment 7 of the present disclosure;

FIG. 34 illustrates a schematic structural diagram of a base stationdevice according to Embodiment 8 of the present disclosure;

FIG. 35 illustrates a schematic structural diagram of a user equipmentaccording to Embodiment 9 of the present disclosure.

DETAILED DESCRIPTION

Embodiments of the present disclosure will be described in detailhereafter. The examples of these embodiments have been illustrated inthe drawings throughout which same or similar reference numerals referto same or similar elements or elements having same or similarfunctions. The embodiments described hereafter with reference to thedrawings are illustrative, merely used for explaining the presentdisclosure and should not be regarded as any limitations thereto.

It should be understood by those skilled in the art that singular forms“a”, “an”, “the”, and “said” may be intended to include plural forms aswell, unless otherwise stated. It should be further understood thatterms “include/including” used in this specification specify thepresence of the stated features, integers, steps, operations, elementsand/or components, but not exclusive of the presence or addition of oneor more other features, integers, steps, operations, elements,components, and/or combinations thereof. It should be understood thatwhen a component is referred to as being “connected to” or “coupled to”another component, it may be directly connected or coupled to otherelements or provided with intervening elements therebetween. Inaddition, “connected to” or “coupled to” as used herein may includewireless connection or coupling. As used herein, term “and/or” includesall or any of one or more associated listed items or combinationsthereof.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by thoseskilled in the art to which the present disclosure belongs. It shall befurther understood that terms, such as those defined in commonly useddictionaries, should be interpreted as having a meaning that isconsistent with their meanings in the context of the prior art and willnot be interpreted in an idealized or overly formal sense unlessexpressly so defined herein.

It should be understood by a person of ordinary skilled in the art thatterm “terminal” and “terminal apparatus” as used herein compasses notonly apparatuses with a wireless signal receiver having no emissioncapability but also apparatuses with receiving and emitting hardwarecapable of carrying out bidirectional communication over a bidirectionalcommunication link. Such apparatuses can include cellular or othercommunication apparatuses with a single-line display or multi-linedisplay or without a multi-line display; Personal Communication Systems(PCSs) with combined functionalities of speech, data processing,facsimile and/or data communication; Personal Digital Assistants (PDAs),which can include RF receivers, pagers, internet/intranet accesses, webbrowsers, notepads, calendars and/or Global Positioning System (GPS)receivers; and/or conventional laptop and/or palmtop computers or otherapparatuses having and/or including a RF receiver. The “terminal” and“terminal apparatus” as used herein may be portable, transportable,mountable in transportations (air, sea and/or land transportations), orsuitable and/or configured to run locally and/or distributed in otherplaces in the earth and/or space for running. The “terminal” or“terminal apparatus” as used herein may be a communication terminal, aninternet terminal, a music/video player terminal. For example, it may bea PDA, a Mobile Internet Device (MID) and/or a mobile phone with amusic/video playback function, or may be apparatuses such as a smart TVand a set-top box.

In a new communication system, a network equipment (e.g., a base stationor an access point equipment) will divide a bandwidth into one or moredifferent bandwidth parts (BWPs). Therefore, during the initial access,the network equipment needs to inform a user equipment (UE) ofinformation about a BWP used by initial access and the positioninformation of a random access resource. Hence, how the networkequipment informs a UE of the information about a BWP used by initialaccess and the position information of a random access resource so thatthe UE can determine the position information of the random accessresource for initial access becomes a problem for those skilled in theart.

For a new system, there may be multiple available Uplink BWPs (UL BWPs).However, during the initial access, a UE does not acquire theconfiguration condition of the BWPs in this network and also does notacquire the configuration condition of random access resources in thisnetwork, so that the UE cannot access to this network. Therefore, anetwork equipment needs to inform the UE of the configuration conditionof UL BWPs and random access resources. The network equipment jointlyinforms the UE of configuration information of the initial UL BWP andinformation about frequency-domain position of random access resources.Upon acquiring the configuration information of the initial UL BWP andthe information about frequency-domain position of random accessresources, the UE is able to find the position of the available randomaccess resource.

Based on the above technical problem to be solved, an embodiment of thepresent disclosure provides a resource configuration method.Specifically, an embodiment of the present disclosure provides aresource configuration method, as shown in FIG. 6, including: step 610:configuring an initial active UL BWP and a corresponding random accessresource; and step 620: transmitting, to a UE, configuration informationof the initial active UL BWP and the corresponding random accessresource configuration information for the UE to perform random accessprocedure.

In the resource configuration method provided by this embodiment of thepresent disclosure, an initial active UL BWP and a corresponding randomaccess resource are configured, so that a prerequisite is provided forthe subsequent transmission of configuration information of the initialactive UL BWP and the corresponding random access resource to a UE; andthen, configuration information of the initial active UL BWP and thecorresponding random access resource are transmitted to the UE for theUE to perform random access procedure, so that information about the BWPused by initial access and the information about the position of therandom access resource are informed to the UE. Accordingly, during theinitial access, the UE can timely acquire the configuration condition ofthe initial active UL BWP and the corresponding random access resourceand thus access to the network.

Preferably, the initial active UL BWP is configured by any one of thefollowing ways: configuring indication information about a lowestnumbered resource block of the initial active UL BWP and indicationinformation about bandwidth of the initial active UL BWP; configuringindication information about the lowest numbered resource block of theinitial active UL BWP; configuring indication information about thebandwidth of the initial active UL BWP; and, configuring an index forindicating the initial active UL BWP.

Preferably, the indication information about the lowest numberedresource block of the initial active UL BWP and/or the indicationinformation about bandwidth of the initial active UL BWP are configuredby any one of the following ways: configuring an index for indicatingthe lowest numbered resource block of the initial active UL BWP and/orand an index for indicating the bandwidth of the initial active UL BWP;and, configuring an index for simultaneously indicating a combination ofthe lowest numbered resource block of the initial active UL BWP and thebandwidth of the initial active UL BWP.

Preferably, the random access resource is configured by any one of thefollowing ways: configuring indication information about a position oflowest PRACH transmission occasion in frequency domain and indicationinformation about a frequency offset between adjacent PRACHs;configuring indication information about a position of lowest PRACHtransmission occasion in frequency domain; and, configuring indicationinformation about a frequency offset between adjacent PRACHs.

Preferably, the indication information about the position of lowestPRACH transmission occasion in frequency domain is configured by any oneof the following ways: configuring indication information about aposition of lowest PRACH transmission occasion in frequency domain andindication information about a frequency offset of the lowest PRACHtransmission occasion in frequency domain with respect to the PRB 0 ofthe initial active UL BWP; configuring indication information about aposition of lowest PRACH transmission occasion in frequency domain inthe initial active UL BWP; and, configuring indication information abouta position of lowest PRACH transmission occasion in frequency domain ina full frequency band.

Preferably, the position of the PRACH transmission occasion in frequencydomain satisfies a symmetrical frequency-hopping rule.

Preferably, the resource configuration method further includes steps of:configuring a beam failure recovery request resource corresponding tothe random access resource; and, transmitting, to the UE, configurationinformation of the beam failure recovery request resource correspondingto the random access resource.

Preferably, the beam failure recovery request resource corresponding tothe random access resource is configured by at least one of thefollowing ways: configuring indication information about a frequencyoffset between a frequency-domain ending position of a first beamfailure recovery request resource and a frequency-domain ending positionof the last PRACH; configuring indication information about a frequencyoffset between adjacent beam failure recovery request resources; and,configuring indication information about a frequency offset between anybeam failure recovery request resource and a neighboring PRACH andindication information about a frequency offset between adjacent PRACHs.

Specifically, in this embodiment of the present disclosure, the networkequipment will divide an available uplink frequency-domain resource intomultiple different BWPs, and the BWPs are identified by absolutePhysical Resource Block (PRB) index, as shown in FIG. 7. The first BWPis from PRB index 0 to PRB index 99; the second BWP is from PRB index100 to PRB index 199; and so on. Wherein, the network equipment maypre-configure the number of PRBs occupied by each BWP, and the bandwidthoccupied by each BWP (i.e., the number of occupied PRBs) may bedifferent. During the initial access, since the UE has not accessed tothe system, the UE has not acquired the bandwidth settings of thesystem, so that the UE is possibly not able to find an initial active ULBWP and also is possibly not able to determine the position of anavailable access resource in the system. Therefore, in this embodimentof the present disclosure, in the system information:

-   -   the network equipment informs the UE of the lowest numbered        resource block and bandwidth (the number of PRBs, bandwidth or        more) of the initial active UL BWP;    -   the network equipment informs the UE of the lowest numbered        resource block of the initial active UL BWP, while the bandwidth        of the initial active UL BWP is pre-configured;    -   the network equipment informs the UE of the bandwidth of the        initial active UL BWP, while the lowest numbered resource block        of the initial active UL BWP is pre-configured;    -   both the lowest numbered resource block of the initial active UL        BWP and the bandwidth of the BWP are pre-configured.

Meanwhile, according to the configured lowest numbered resource block ofthe initial active UL BWP, the network equipment informs the UE of thefrequency-domain position of a corresponding PRACH.

-   -   If PRACHs are arranged continuously, the network equipment        informs the UE of a frequency offset of a lowest PRACH        transmission occasion in frequency domain with respect to the        PRB 0 of the initial active UL BWP.    -   If PRACHs are arranged discontinuously, the network equipment        informs the UE of a frequency offset of the lowest PRACH        transmission occasion in frequency domain with respect to with        respect to PRB 0 of the initial active UL BWP and informs the UE        of a frequency offset between two adjacent PRACHs.

The UE determines the position of the initial active UL BWP according tothe configuration information of the initial active UL BWP acquired fromthe system information, and then determines a frequency-domain startingposition of an available PRACH according to the configurationinformation of the PRACH.

Another embodiment of the present disclosure provides a resourcedetermination method, as shown in FIG. 8, including: step 810: acquiringconfiguration information of an initial active UL BWP and correspondingrandom access resource configuration information; step 820: determining,based on the configuration information of the initial active UL BWP andthe configuration information of the random access resource, thecorresponding PRACH occasions; and step 830: performing random accessprocedure based on the determined PRACH occasions.

In the resource determination method provided by this embodiment of thepresent disclosure, configuration information of an initial active ULBWP and corresponding random access resource configuration informationare acquired, so that a prerequisite is provided for the subsequentdetermination of a corresponding PRACH for initial access based on theconfiguration information; and then, the corresponding PRACH occasionsare determined based on the configuration information of the initialactive UL BWP and the configuration information of the random accessresource, so that a UE can find the position of the available PRACHoccasion and then perform random access procedure based on thedetermined PRACH occasions. Accordingly, the UE can perform randomaccess procedure based on this PRACH occasion so as to access to thenetwork.

Preferably, the configuration information of the initial active UL BWPis acquired by any one of the following ways: receiving indicationinformation about a lowest numbered resource block of the initial activeUL BWP and indication information about bandwidth of the initial activeUL BWP; receiving indication information about the lowest numberedresource block of the initial active UL BWP, and acquiring apre-configured bandwidth of the initial active UL BWP; receivingindication information about the bandwidth of the initial active UL BWP,and acquiring a pre-configured lowest numbered resource block of theinitial active UL BWP; acquiring the pre-configured lowest numberedresource block and bandwidth of the initial active UL BWP; and,receiving an index for indicating the initial active UL BWP.

Preferably, the indication information about the lowest numberedresource block of the initial active UL BWP and/or the indicationinformation about bandwidth of the initial active UL BWP are received byany one of the following ways: receiving an index for indicating thelowest numbered resource block of the initial active UL BWP and/or anindex for indicating the bandwidth of the initial active UL BWP; and,receiving an index for simultaneously indicating a combination of thelowest numbered resource block of the initial active UL BWP and thebandwidth of the initial active UL BWP.

Preferably, the configuration information of the random access resourceis acquired by any one of the following ways: receiving indicationinformation about a position of lowest PRACH transmission occasion infrequency domain and indication information about a frequency offsetbetween adjacent PRACHs; receiving indication information about theposition of lowest PRACH transmission occasion in frequency domain, andacquiring the pre-configured offset between adjacent PRACHs; acquiringthe pre-configured position of lowest PRACH transmission occasion infrequency domain, and receiving indication information about the offsetbetween adjacent PRACHs; and, acquiring the pre-configured position oflowest PRACH transmission occasion in frequency domain and the offsetbetween adjacent PRACHs.

Preferably, the step of determining the corresponding PRACH occasionsbased on the configuration information comprises any one of thefollowing: based on the lowest numbered resource block and bandwidth ofthe initial active UL BWP, the position of lowest PRACH transmissionoccasion in frequency domain and the offset between adjacent PRACHs,determining the corresponding PRACH occasions; based on the lowestnumbered resource block and bandwidth of the initial active UL BWP andthe position of lowest PRACH transmission occasion in frequency domain,determining the corresponding PRACH occasions; and, based on the lowestnumbered resource block and bandwidth of the initial active UL BWP andthe offset between adjacent PRACHs, determining the corresponding PRACHoccasions.

Preferably, the indication information about the position of lowestPRACH transmission occasion in frequency domain is received by any oneof the following ways: receiving indication information about afrequency offset of the lowest PRACH transmission occasion in frequencydomain with respect to PRB 0 of the initial active UL BWP; and,receiving indication information about a position of lowest PRACHtransmission occasion in frequency domain in the initial active UL BWP.

Preferably, the resource determination method further includes a stepof: after the acquisition of the position of lowest PRACH transmissionoccasion in frequency domain, determining, according to a symmetricalfrequency-hopping rule, frequency-domain positions of other PRACHsexcept for the first PRACH.

Preferably, the resource determination method further includes a stepof: acquiring configuration information of a beam failure recoveryrequest resource corresponding to the random access resource, anddetermining, based on the configuration information and/or the PRACHoccasions, a corresponding beam failure recovery request resource.

Preferably, the configuration information of a beam failure recoveryrequest resource corresponding to the random access resource is acquiredby at least one of the following ways: receiving indication informationabout a frequency offset between a frequency-domain ending position of afirst beam failure recovery request channel and a frequency-domainending position of the last PRACH, and receiving indication informationabout a frequency offset between adjacent beam failure recovery requestchannels; acquiring a pre-configured frequency offset between thefrequency-domain ending position of the first beam failure recoveryrequest channel and the frequency-domain ending position of the lastPRACH, and receiving indication information about the frequency offsetbetween adjacent beam failure recovery request channels; receivingindication information about the frequency offset between thefrequency-domain ending position of the first beam failure recoveryrequest channel and the frequency-domain ending position of the lastPRACH, and acquiring indication information about a pre-configuredfrequency offset between adjacent beam failure recovery requestchannels; acquiring indication information about a pre-configuredfrequency offset between the frequency-domain ending position of thefirst beam failure recovery request channel and the frequency-domainending position of the last PRACH, and acquiring indication informationabout a pre-configured frequency offset between adjacent beam failurerecovery request channels; receiving indication information about afrequency offset between any beam failure recovery request channel and aneighboring PRACH and indication information about a frequency offsetbetween adjacent PRACHs; receiving indication information about afrequency offset between any beam failure recovery request channel and aneighboring PRACH, and acquiring indication information about apre-configured frequency offset between adjacent PRACHs; acquiringindication information about a pre-configured frequency offset betweenany beam failure recovery request channel and a neighboring PRACH, andreceiving indication information about the frequency offset betweenadjacent PRACHs; and, acquiring indication information about apre-configured frequency offset between any beam failure recoveryrequest channel and a neighboring PRACH and indication information abouta frequency offset between adjacent PRACHs.

Preferably, the step of determining, based on the configurationinformation and the PRACH occasions, a corresponding beam failurerecovery request resource includes any one of the following: accordingto the frequency offset between the frequency-domain ending position ofthe first beam failure recovery request channel and the frequency-domainending position of the last PRACH as well as the frequency-domain endingposition of the last PRACH, determining a first beam failure recoveryrequest channel resource; and, according to the frequency offset betweenany beam failure recovery request channel and a corresponding PRACH andthe frequency offset between adjacent PRACHs, determining any beamfailure recovery request channel resource.

The embodiments of the present disclosure will be comprehensivelydescribed below by the following preferred implementations.

Embodiment 1

In Embodiment 1, description will be given on how a UE acquires, byconfiguration information of a network equipment, an initial active ULBWP and a frequency-domain position of an available PRACH. In thepresent disclosure, the frequency-domain position will be expressed byan index of a frequency-domain resource unit or one or morefrequency-domain resource unit offset, wherein the frequency-domainresource unit may be a subcarrier, a subcarrier group, a PRB, a PRBgroup or more. For simplicity, in the description of Embodiment 1, thefrequency-domain resource units are described as PRBs.

First, during the initial access, a UE may search Synchronization Signal(SS) block signals from a same cell, then find system informationconfigured by a network equipment by successfully reading a broadcastmessage in the SS block, and acquire configuration information of aninitial active UL BWP (i.e., receive configuration information of theinitial active UL BWP in the system information), wherein

-   -   A PRB index of the initial active UL BWP and the bandwidth of        the BWP directly configured by the network equipment are read by        the following specific ways:    -   The PRB index and the bandwidth are directly indicated by N        bits. For example, the PRB index=200 of the lowest numbered        resource block of the initial active UL BWP is configured by 9        bits in the system information, and the bandwidth indicated by        the 9 bits is 100 PRBs, as shown in FIG. 7, that is, it is        indicated that the initial active UL BWP starts from the 200th        PRB of the uplink bandwidth of the whole system and occupies the        bandwidth of 100 PRBs.    -   The UE receives indication information about the lowest numbered        resource block of the initial active UL BWP from the network        equipment, wherein the indication information is in the form of        an index. An PRB index is directly indicated by N bits, or an        N-bit index indicates multiple possible PRB indexes through a        look-up table; and, the bandwidth is directly indicated by M        bits, or indicated by an M-bit index through a look-up table.        For example, four possible PRB indexes are indicated by N=2        bits. As shown in Table 1, possible PRB indexes indicated by the        2 bits are 0, 100, 200 and 300, respectively.

TABLE 1 Indication examples of the PRB index of the lowest numberedresource block of the initial active uplink BWP PRB index of the lowestBit value numbered resource block 00 0 01 100 10 200 11 300

Similarly, four possible bandwidths are indicated by M=2 bits. As shownin table 2, possible bandwidths indicated by the 2 bits are 50 PRBs, 100PRBs, 150 PRBs and 200 PRBs, respectively.

TABLE 2 Indication examples of the bandwidth of the initial activeuplink BWP Bit value Bandwidth (the number of PRBs) 00 50 01 100 10 15011 200

In addition, the PRB index of the lowest numbered resource block of theinitial active UL BWP and the bandwidth occupied by frequency domain mayalso be jointly indicated by an N-bit index. As shown Table 3, fourpossible combinations of the PRB index and the bandwidth occupied byfrequency domain are indicated by N=2 bits.

TABLE 3 Indication examples of the PRB index of the lowest numberedresource block of the initial active uplink BWP and the bandwidth of thefrequency domain PRB index of the lowest numbered resource block (thebandwidth of the Bit value frequency domain) 00  0(50) 01 100(100) 10200(150) 11 300(200)

-   -   Particularly, the PRB index of the lowest numbered resource        block of the initial active UL BWP directly configured by the        network is read, but the bandwidth of the initial active UL BWP        is pre-configured. For example, the network equipment        pre-configures the bandwidth of the initial active UL BWP as 100        PRBs, and the PRB index is informed by the above possible ways        and will not be repeated here.    -   Particularly, the BWP of the initial active UL BWP directly        configured by the network equipment is read, but the PRB index        of the lowest numbered resource block of the initial active UL        BWP is pre-configured by the network. For example, the network        equipment pre-configures that the PRB index of the initial        active UL BWP is counted from the 200th PRB, and the bandwidth        (i.e., the number of the occupied PRBs) is informed by the above        possible ways and will not be repeated here.    -   Particularly, both the PRB index and the bandwidth of the        initial active UL BWP are pre-configured. For example, the PRB        index of the lowest numbered resource block of the initial        active UL BWP is pre-configured to be counted from the 200th        PRB, and the bandwidth is pre-configured as 100 PRBs.    -   The index of the initial active UL BWP configured by the network        equipment is read. In this case, the UE is informed of the        configuration information (the starting PRB index and/or the        corresponding BWP bandwidth) of all or part of possible UL BWPs        in a pre-configured way or by using a system message, and each        possible UL BWP corresponds to an index for the UL BWP.        Meanwhile, in the system message, the UE may be informed of the        index of the initial active UL BWP directly by an N-bit index or        by an N-bit index through a look-up table. As shown in Table 4,        BWP indexes of four possible initial active UL BWPs are informed        by N=2 bits.

TABLE 4 Indication examples of the BWP index of the initial activeuplink BWP Bit value UL BWP index 00 0 01 1 10 2 11 3

Upon acquiring the configuration information of the initial active ULBWP configured by the network equipment, the UE determines, according tothe configuration information, the starting position and/or bandwidth ofthe initial active UL BWP. Therefore, according to the determinedconfiguration of the initial active UL BWP and the configurationinformation of the random access resource informed in the systeminformation, the frequency-domain positions of M (M>=1) available PRACHsare determined, and initial access is performed according to the PRACHat these frequency-domain positions, specifically including:

-   -   When the M PRACH occasions are continuous,    -   a pre-configured position of lowest PRACH transmission occasion        in frequency domain is the Xth PRB or is X PRBs from the lowest        numbered resource block of the initial active UL BWP.    -   X is a frequency offset from the lowest numbered resource block        of the initial active UL BWP. For example, when X=2, it is        indicated that the frequency-domain starting position of the        first available random access channel has 2 PRBs away from the        lowest numbered resource block of the initial active UL BWP.    -   Particularly, when X=0, it is indicated that the        frequency-domain starting position of the first available PRACH        is the lowest numbered resource block of the initial active UL        BWP.    -   The UE receives a frequency offset of the lowest PRACH        transmission occasion in frequency domain with respect to PRB 0        of the initial active UL BWP configured by the network        equipment. The method for configuring the offset is shown in        FIG. 7. For example, the network equipment configures that the        first available PRACH has a frequency offset of 3 PRBs from the        lowest numbered resource block of the initial active UL BWP, so        that it is indicated that the frequency-domain starting position        of the first available PRACH is after 3 PRBs from the lowest        numbered resource block of the initial active UL BWP.        Particularly, the offset may be directly indicated by N bits, or        the offset may be indicated by N bits through a look-up table.        The look-up table is the same as the above look-up table and        will not be repeated here.    -   The UE reads the position of lowest PRACH transmission occasion        in frequency domain in the initial active UL BWP configured by        the network equipment, for example, the frequency-domain        starting position is the Xth PRB of the initial active UL BWP.        For example, the network equipment configures that the first        available PRACH is at the third PRB of the initial active UL        BWP. Particularly, the value of X may be directly indicated by N        bits, or the value of X may be indicated by N bits through a        look-up table. The look-up table is the same as the above        look-up table and will not be repeated here.    -   The UE reads the position of lowest PRACH transmission occasion        in frequency domain in a full frequency band configured by the        network equipment, for example, the frequency-domain starting        position is the Xth PRB of the full frequency band part. For        example, the network equipment configures that the first        available PRACH is at the 303rd PRB of the full frequency band        part. Particularly, the value of X may be directly indicated by        N bits, or the value of X may be indicated by N bits through a        look-up table. The look-up table is the same as the above        look-up table and will not be repeated here.    -   When the M PRACH occasions are discontinuous,    -   the network equipment configures or pre-configures that the        position of lowest PRACH transmission occasion in frequency        domain is the Xth PRB of the initial active UL BWP, or the Xth        PRB of the full frequency band part, or away X PRBs from the        lowest numbered resource block of the initial active UL BWP. For        other PRACHs:    -   The UE reads a bandwidth interval of Y RPBs configured or        pre-configured by the network equipment. As shown in FIG. 9, the        UE finds the position of lowest PRACH transmission occasion in        frequency domain by a pre-configured value of X, and then        determines the positions of the remaining PRACHs according to        the configured bandwidth interval Y between adjacent PRACHs. The        value of Y may be directly informed by N bits or informed by N        bits through a look-up table. The look-up table is similar to        the above look-up table and will not be repeated here.    -   The UE determines, according to a symmetrical frequency-hopping        rule configured by the network equipment, the frequency-domain        positions of the remaining PRACHs, as shown in FIG. 10. After        the UE determines the first PRACH, by using the central position        of the initial active UL BWP as axis, the UE symmetrically finds        a second PRACH. The frequency-domain ending position of this        PRACH also has X PRBs away from the ending position of the        initial active UL BWP. A starting position of a third PRACH has        Y PRBs away from the ending position of the first PRACH.        Similarly, a starting position of a fourth PRACH is also        determined according to the frequency-hopping rule.        Particularly, Y may be 0.    -   Particularly, the bandwidth interval in the frequency domain is        pre-configured as X PRBs, or the network equipment configures        the bandwidth interval in the frequency domain as X PRBs. That        is, the first PRACH has X PRBs away from the lowest numbered        resource block of the initial active UL BWP, and the offset        between adjacent PRACHs in the frequency domain is also X PRBs,        as shown in FIG. 11. Particularly, it is also possible to        determine other PRACHs except for the first PRACH by the        frequency-hopping rule. That is, after the UE determines the        first PRACH, by using the central position of the initial active        UL BWP as axis, the UE symmetrically finds a second PRACH, and        the frequency-domain ending position of this PRACH also has X        PRBs away from the ending position of the initial active UL BWP.        A starting position of a third PRACH has Y PRBs away from the        ending position of the first PRACH. Similarly, a starting        position of a fourth PRACH is also determined according to the        frequency-hopping rule.    -   Particularly, X=0. That is, the network equipment pre-configures        that the first PRACH starts from the lowest numbered resource        block of the initial active UL BWP, and the remaining PRACHs are        determined according to the offset of Y PRBs between adjacent        PRACHs, as shown in FIG. 12. Particularly, it is also possible        to determine other PRACHs except for the first PRACH by the        frequency-hopping rule. That is, after the UE determines the        first PRACH, by using the central position of the initial active        UL BWP as axis, the UE symmetrically finds a second PRACH, and        the frequency-domain ending position of this PRACH also has X        PRBs away from the ending position of the initial active UL BWP.        A starting position of a third PRACH has Y PRBs away from the        ending position of the first PRACH. Similarly, a starting        position of a fourth PRACH is also determined according to the        frequency-hopping rule.

Embodiment 2

In Embodiment 2 of the present disclosure, determining, by a UE,possible beam failure recovery request resources according to thedetermined PRACH occasions and the beam failure recovery requestresource information pre-configured or configured by a network equipmentwill be described.

Preferably, it is possible to acquire, by configuration information ofthe network equipment, an initial active UL BWP and a frequency-domainposition of a corresponding available beam failure recovery requestresource by a method similar to that in Embodiment 1, wherein a methodfor configuring the frequency-domain position of the beam failurerecovery request resource is the same as the method for configuring thefrequency-domain position of the above random access resource and willnot be repeated here, and the time-domain position of the available beamfailure recovery request resource is the same as the time-domainposition of the available random access resource.

Preferably, it is also possible to determine a frequency-domain positionof an available beam failure recovery request resource by the determinedinitial active UL BWP and the frequency position of the correspondingavailable PRACH as well as the configured beam failure recovery requestresource configuration information.

-   -   When the determined M available PRACHs are continuous,    -   A UE finds a first available beam failure recovery request        resource by the offset of Z PRBs between the frequency-domain        ending position of the first beam failure recovery request        resource and the frequency-domain ending position of the last        PRACH pre-configured or informed by the configuration of the        network equipment, as shown in FIG. 13. For example, if the X        pre-configured or configured by the network equipment is 3 PRBs        and each PRACH occupies 6 PRBs, in this case, the network        equipment configures four continuous available PRACH occasions,        and the configured Z is 3 PRBs, so that it is indicated the        frequency-domain position of the first available beam failure        recovery request resource starts from the 30th PRB away from the        lowest numbered resource block of the initial active UL BWP. The        specific value of Z may be informed by N bits, or the configured        value of Z may be obtained by N bits through a look-up table.        The look-up table is similar to that in the foregoing embodiment        and will not be repeated here.    -   Particularly, Z may be pre-configured or configured as 0, so        that it is indicated that the PRACHs and the beam failure        recovery request resources are continuous in the frequency        domain.    -   In addition, the UE may also determine, by the offset of D PRBs        between two adjacent beam failure recovery request channels        pre-configured or informed by the configuration of the network        equipment, subsequent available beam failure recovery request        channels, as shown in FIG. 13. For example, if the D        pre-configured or configured by the network equipment is 1 PRB,        a frequency-domain starting position of a next beam failure        recovery request channel is obtained after adding D=1 PRB to a        frequency-domain ending position of a previous beam failure        recovery request channel. The specific value of D may be        informed by N bits, or the configured value of D may be obtained        by N bits through a look-up table. The look-up table is similar        to that in the foregoing embodiment and will not be repeated        here.    -   Particularly, D may be pre-configured or configured as 0, so        that it is indicated that the available beam failure recovery        request resources are continuous in the frequency domain.    -   When the determined M available PRACHs are discontinuous,    -   A UE finds a first available beam failure recovery request        resource according to the offset of Z PRBs between the        frequency-domain ending position of the first beam failure        recovery request resource and the frequency-domain ending        position of the last PRACH pre-configured or informed by the        configuration of the network equipment, as shown in FIG. 14. For        example, if the X pre-configured or configured by the network        equipment is 3 PRBs, the offset Y between every two adjacent        PRACHs is 1 PRB and each PRACH occupies 6 PRBs, in this case,        the network equipment configures four continuous available PRACH        occasions, and the configured Z is 3 PRBs, so that it is        indicated the frequency-domain position of the first available        beam failure recovery request resource starts from the 33th PRB        away from the lowest numbered resource block of the initial        active UL BWP. The specific value of Z may be informed by N        bits, or the configured value of Z may be obtained by N bits        through a look-up table. The look-up table is similar to that in        the foregoing embodiment and will not be repeated here.    -   Particularly, Z may be pre-configured or configured as 0, so        that it is indicated that the PRACHs are immediately followed by        the beam failure recovery request resources in the frequency        domain.    -   In addition, the UE may also determine, according to the offset        of D PRBs between two adjacent beam failure recovery request        channels pre-configured or informed by the configuration of the        network equipment, subsequent available beam failure recovery        request channels, as shown in FIG. 14. For example, if the D        pre-configured or configured by the network equipment is 1 PRB,        a frequency-domain starting position of a next beam failure        recovery request channel is obtained after adding D=1 PRB to a        frequency-domain ending position of a previous beam failure        recovery request channel. The specific value of D may be        informed by N bits, or the configured value of D may be obtained        by N bits through a look-up table. The look-up table is similar        to that in the foregoing embodiment and will not be repeated        here.    -   Particularly, D may be pre-configured or configured as 0, so        that it is indicated that the available beam failure recovery        request resources are continuous in the frequency domain.    -   Particularly, in the two ways, the frequency-domain position of        the beam failure recovery request resource is determined        relative to the corresponding position of the last PRACH.        However, in the following way, the present disclosure proposes        that the frequency-domain position of a corresponding beam        failure recovery request resource is determined according to        each PRACH separately. That is, a frequency offset of Y PRBs        between a next neighboring PRACH and this PRACH and a frequency        offset of D PRBs between a next neighboring beam failure        recovery request resource and this PRACH will be pre-configured        or informed by the configuration of the network equipment. As        shown in FIG. 15, when the UE has determined the position of the        first PRACH (PRACH #1), it is known according to Y=5 PRBs and        D=1 PRB pre-configured or informed by the configuration of the        network equipment that a position after 1 PRB from the ending        position of this PRACH corresponds to a frequency-domain        starting position of a beam failure recovery request resource        (BFRQ#1), and a position after 5 PRBs from the ending position        of this PRACH corresponds to a frequency-domain starting        position of a next PRACH (PRACH#2).

It is to be noted that, the forgoing description merely shows preferredembodiments of the present application and is not intended to limit thepresent application. Any modification, equivalent replacement orimprovement made within the spirit and principle of the presentapplication shall fall into the protection scope of the presentapplication.

Another embodiment of the present disclosure provides a networkequipment, as shown in FIG. 16, including a configuring module 1621 anda transmitting module 1622.

Wherein, the configuring module 1621 is configured to configure aninitial active UL BWP and a corresponding random access resource. Thetransmitting module 1622 is configured to transmit, to a UE,configuration information of the initial active UL BWP and thecorresponding random access resource configuration information for theUE to perform random access procedure.

Another embodiment of the present disclosure provides a user equipment,as shown in FIG. 17, including an acquiring module 1731, a determiningmodule 1732 and an access module 1733.

The acquiring module 1731 is configured to acquire configurationinformation of an initial active UL BWP and corresponding random accessresource configuration information.

The determining module 1732 is configured to determine, based on theconfiguration information of the initial active UL BWP and theconfiguration information of the random access resource, thecorresponding PRACH occasions.

The access module 1733 is configured to perform random access procedurebased on the determined PRACH occasions.

Another embodiment of the present disclosure provides a networkequipment, including: a processor; and a memory configured to storemachine-readable instructions which, when executed by the processor,enable the processor to execute the resource configuration methoddescribed above. The network equipment may be specifically a basestation equipment, a network access point equipment, a network repeateror more.

Another embodiment of the present disclosure provides a user equipment,including: a processor; and a memory configured to storemachine-readable instructions which, when executed by the processor,enable the processor to execute the resource determination methoddescribed above.

FIG. 18 schematically shows a block diagram of a computing system forimplementing the network equipment or user equipment according to anembodiment of the present disclosure.

As shown in FIG. 18, the computing system 1800 includes a processor1810, a computer-readable storage medium 1820, an output interface 1830and an input interface 1840. The computing system 1800 may execute themethod described above with reference to FIG. 5 or FIG. 8, to configurea reference signal and then perform data transmission based on thisreference signal.

Specifically, for example, the processor 1810 may include ageneral-purpose microprocessor, an instruction set processor and/or arelated chipset and/or a dedicated microprocessor (e.g., an ApplicationSpecific Integrated Circuit (ASIC), or more. The processor 1810 mayfurther include an onboard memory for cache purpose. The processor 1810may be a single processing unit or multiple processing units used forexecuting different actions in the method flow described with referenceto FIG. 5 or FIG. 8.

For example, the computer-readable storage medium 1820 may be any mediumcapable of containing, storing, conveying, propagating or transmittinginstructions. For example, the readable storage medium may include, butnot limited to: electrical, magnetic, optical, electromagnetic, infraredor semiconductor systems, apparatuses, devices or propagation mediums.The specific examples of the readable storage medium include: a magneticstorage device, such as a magnetic tape or a Hard Disk Drive (HDD); anoptical storage device, such as CD-ROM; a memory, such as a RandomAccess Memory (RAM) or a flash memory; and/or, a wired/wirelesscommunication link.

The computer-readable storage medium 1820 may include computer programs.The computer programs may include codes/computer-executable instructionswhich, when executed by the processor 1810, enable the processor 1810 toexecute the method flow described above with reference to FIG. 5 or FIG.8 and any variations thereof.

The computer programs may be configured to have computer program codes,for example, including computer program modules. For example, in anexemplary embodiment, the codes in the computer programs may include oneor more program modules, for example, module 1, module 2, or more. It isto be noted that, the division mode and the number of modules are notfixed, and a proper program module or a combination of program modulesmay be used by those skilled in the art according to the actualsituation. When the combination of program modules is executed by theprocessor 1810, the processor 1810 may execute the method flow describedabove with reference to FIG. 5 or FIG. 8 and any variations thereof.

According to the embodiments of the present disclosure, the processor1810 may use the output interface 1830 and the input interface 1840 toexecute the method flow described above with reference to FIG. 5 or FIG.8 and any variations thereof.

With respect to the transmitting problem of random access preamble undermulti-beam operation in 5G, the present disclosure provides a method forconfiguring a transmit power of a random access preamble, as shown inFIG. 19, and the specific flow is as follows:

a terminal detects a downlink synchronization signal and selects anappropriate synchronization signal block according to a preset criteria;

the terminal reads the broadcast channel of the selected synchronizationsignal block, and acquires configuration information in a maininformation block carried by the broadcast channel and configurationinformation in the system information block indicated by the primaryinformation block;

the terminal computes the path loss of the selected synchronizationsignal block according to the power configuration information in theconfiguration information of the primary information block;

the terminal obtains the location of random access occasiontime-frequency resources, and determines a required random accesspreamble, according to the random access configuration informationcontained in the configuration information in the system information;

the terminal determines the transmit power for transmitting the randomaccess preamble according to the computed path loss; and

the terminal transmits the determined random access preamble, by usingthe computed transmit power of the random access preamble, on thedetermined random access occasion.

wherein the random access configuration information at least comprisesrandom access channel configuration information, which is used forindicating time-frequency resources of the random access occasioncorresponding to different synchronization signal blocks. At the sametime, the random access configuration information further includes theformat information of the random access preamble, which is used forindicating the structure of the random access preamble and the structureof the random access occasion. The random access configurationinformation further includes power configuration information in therandom access process, such as a target receiving preamble power, apower ramping interval, etc.

In addition, it should be noted that in the above description, the stepof acquiring configuration information (including acquiring randomaccess configuration information and power configuration information)can be performed in parallel. The step of determining time-frequencyresources, a preamble and a transmit power can also be performed inparallel.

At the same time, the method provided by the disclosure is also suitablefor determining the power when a random access attempt fails and theterminal initiates a retry. Specifically, if the terminal finds that therandom access attempt fails, its behavior can be summarized as follows:

the terminal determines random access occasion time-frequency resourcesand random access preamble resources selected in this random accessattempt according to configuration information;

the terminal determines the power level of this random access attemptaccording to the power level of the previous random access processattempt; and

the terminal adopts the determined transmit power level on the selectedrandom access occasion to transmit the determined random accesspreamble.

It should be noted that when determining the random access occasion, theterminal can refer to the latest measurement result to determine anappropriate synchronization signal block. If the corresponding randomaccess occasion has been determined, and the path loss is recomputedaccording to the transmit power configuration of the synchronizationsignal block and the measurement result of the synchronization signalblock, the transmit power of the random access preamble is determinedaccording to the transmit power configuration of the synchronizationsignal block. When determining the transmit power of the preamble,reference can also be made to the retransmission times counter or thepower ramping counter to determine the transmit power of the randomaccess preamble.

Based on the configuration method of the transmit power of the randomaccess preamble according to the present disclosure, the method fortransmitting the random access preamble is described in detail below, asshown in FIG. 20, which includes:

Step 2001, detecting a synchronization signal block to obtain areference signal receiving power.

Step 2002, determining a target synchronization signal block accordingto the reference signal receiving power, and acquiring configurationinformation carried in the target synchronization signal block.

Wherein the step of determining the target synchronization signal blockaccording to the reference signal receiving power comprises any one ofthe following:

selecting a synchronization signal block corresponding to the referencesignal receiving power with the largest value among the reference signalreceiving powers as a target synchronization signal block; or,

selecting synchronization signal blocks corresponding to multiplereference signal receiving powers higher than a first preset thresholdamong the reference signal receiving powers, and randomly selecting onesynchronization signal block as a target synchronization signal blockwith an the equivalent probability among the selected synchronizationsignal blocks; selecting a synchronization signal block corresponding tothe reference signal receiving power with the largest value as a targetsynchronization signal block, if there is no reference signal receivingpower higher than the first preset threshold in the reference signalreceiving powers; or,

computing the path loss of each synchronization signal block accordingto each of the reference signal receiving powers and the transmit powerindicated in the configuration information carried in the correspondingsynchronization signal block, and selecting the target synchronizationsignal block according to the path loss.

Further, the step of selecting the target synchronization signal blockaccording to the path loss may include the following two ways:

selecting the synchronization signal block with the smallest path lossas the target synchronization signal block; or,

selecting synchronization signal blocks corresponding to multiple pathlosses lower than a second preset threshold among the path losses, andrandomly selecting one synchronization signal block as a targetsynchronization signal block with the equivalent probability among theselected synchronization signal blocks; and selecting thesynchronization signal block with the smallest path loss as the targetsynchronization signal block, if there is no path loss lower than thesecond preset threshold among the path losses.

Step 2003, determining a random access channel and a random accesspreamble according to the configuration information, and determining thetransmit power of the random access preamble according to theconfiguration information and the reference signal receiving power.

In this step, the configuration information is power configurationinformation, and the step of determining the transmit power of therandom access preamble according to the configuration information andthe reference signal receiving power comprises:

determining the transmit power of the target synchronization signalblock according to the power configuration information;

computing the path loss of the target synchronization signal blockaccording to the transmit power of the target synchronization signalblock and the reference signal receiving power; and

computing to obtain the transmit power of the random access preambleaccording to the power configuration information and the path loss ofthe target synchronization signal block.

Further, the step of determining the transmit power according to thepower configuration information includes any one of the following ways:

1) acquiring the transmit power of the target synchronization signalblock; and

2) determining the transmit power according to the reference transmitpower and the power fluctuation parameters.

The following describes the above ways respectively.

For way 1)

The step of acquiring the transmit power of the target synchronizationsignal block comprises:

-   -   acquiring quantized transmit powers carried in the power        configuration information.

Or,

-   -   acquiring first index information of the target synchronization        signal block carried in the power configuration information; and        checking a transmit power mapping list according to first index        information, and acquiring the transmit power corresponding to        the first index information.

Or,

-   -   acquiring a power configuration parameter sequence contained in        the configuration parameter; wherein the power configuration        parameter sequence is a sequence composed of transmit power        information corresponding to each synchronization signal block        group in the current power group; and determining the transmit        power according to the index information of the target        synchronization signal block and the power configuration        parameter sequence.

Or,

-   -   acquiring the number of power groups contained in the power        configuration information, synchronization signal block index        information in each power group, a synchronization signal block        index sequence and transmit power configuration information        corresponding to each power group; wherein one power group        consists of multiple synchronization signal blocks, and the        transmit power configuration information of all synchronization        signal blocks in each power group is the same as each other; the        synchronization signal block index sequence is a sequence        composed of index information of multiple synchronization signal        blocks with the same transmit power;    -   selecting a power group matched with the target synchronization        signal block according to the index information of the target        synchronization signal block, the synchronization signal block        index information in each power group and the synchronization        signal block index sequence; and    -   determining the transmit power according to the transmit power        configuration information corresponding to the selected power        group.

Wherein if number of synchronization signal blocks in each power groupis different, the power configuration information further includes thenumber of synchronization signal blocks in each power group.

Or,

-   -   acquiring number of power groups contained in the power        configuration information, index information of synchronization        signal block groups in each power group and transmit power        configuration information corresponding to each synchronization        signal block group in each power group; wherein one power group        consists of multiple synchronization signal block groups, and        the transmit power configuration information of all        synchronization signal blocks in each synchronization signal        block group of each power group is the same;    -   selecting synchronization signal block groups in the power        groups matched with the target synchronization signal block        according to the index information of the target synchronization        signal block and the synchronization signal block group index        information in each power group; and    -   determining the transmit power according to the transmit power        configuration information corresponding to the selected        synchronization signal block group.

Or,

-   -   acquiring transmit power configuration information corresponding        to a power group contained in the power configuration        information; wherein one power group consists of multiple        synchronization signal block groups, and the transmit power        configuration information of all synchronization signal blocks        in each synchronization signal block group of each power group        is the same as each other; and    -   determining the transmit power configuration information        corresponding to the power group as the transmit power of the        target synchronization information block.

For way 2), it can also specifically include the following four methods:

The step of determining the transmit power according to the referencetransmit power and the power fluctuation parameters comprises:

(1) acquiring a quantized reference transmit power and second indexinformation carried in the power configuration information;

-   -   checking a power fluctuation parameter mapping list according to        the second index information, and acquiring the power        fluctuation parameters corresponding to the second index        information; and    -   computing and acquiring the transmit power of the target        synchronization signal block according to the quantized        reference transmit power and the power fluctuation parameters.

(2) acquiring the quantized reference transmit power and the quantizedpower fluctuation parameters carried in the power configurationinformation; and

-   -   computing and acquiring the transmit power of the target        synchronization signal block according to the quantized        reference transmit power and the quantized power fluctuation        parameters.

(3) acquiring second index information of the target synchronizationsignal block carried in the power configuration information;

-   -   checking a power fluctuation parameter mapping list according to        the second index information, and acquiring the power        fluctuation parameters corresponding to the second index        information; and    -   computing and acquiring the transmit power of the target        synchronization signal block according to the preset reference        transmit power and the power fluctuation parameters.

(4) acquiring preconfigured power fluctuation parameters and third indexinformation carried in the power configuration information;

-   -   checking a reference transmit power mapping list according to        the third index information, and acquiring the reference        transmit power corresponding to the third index information; and    -   computing and acquiring the transmit power of the target        synchronization signal block according to the reference transmit        power and the power fluctuation parameters.

(5) acquiring second index information and third index informationcarried in the power configuration information;

-   -   checking a power fluctuation parameter mapping list according to        the second index information, and acquiring the power        fluctuation parameters corresponding to the second index        information;    -   checking a reference transmit power mapping list according to        the third index information, and acquiring the reference        transmit power corresponding to the third index information; and    -   computing and acquiring the transmit power of the target        synchronization signal block according to the reference transmit        power and the power fluctuation parameters.

In this step, the process of computing the transmit power of the randomaccess preamble according to the power configuration information and thepath loss of the target synchronization signal block is furtherincluded, and the process includes:

-   -   acquiring initial target preamble receiving power information in        the power configuration information;    -   computing a target receiving power of a preamble according to        the initial target preamble receiving power information; and    -   computing and obtaining the transmit power of the random access        preamble according to the target receiving power and the path        loss of the preamble.

Wherein the process further includes:

-   -   acquiring power control parameters carried in the power        configuration information; and    -   adjusting the preamble target receiving power or the transmit        power of the random access preamble according to the power        control parameters.

Further, the step of acquiring power control parameters carried in thepower configuration information comprises:

-   -   acquiring power control parameters of the target synchronization        signal block carried in the power configuration information; or,    -   acquiring fourth index information of the target synchronization        signal block carried in the power configuration information; and        checking a power control parameter mapping list according to the        fourth index information, and acquiring the power control        parameters corresponding to the fourth index information.

Step 2004, transmitting the random access preamble on the random accesschannel according to the transmit power.

Based on the transmitting method of the random access preamble accordingto the present disclosure, the following specific embodiments aredescribed in detail by way of example.

Embodiment 3

In this embodiment, a method for configuring a transmit power of arandom access preamble will be introduced in combination with a specificsystem. In this embodiment, an initial access process is completed inthe system by transmitting a downlink synchronization signal block.Specifically, one or more downlink synchronization signal blocks areconfigured in the system, and each downlink synchronization signal blockconsists of a primary synchronization signal, a secondarysynchronization signal and a broadcast channel. For a system operated inmulti-beam operation, the base station configures multiplesynchronization signal blocks. Different synchronization signal blocksare transmitted by using the same or different downlink transmit beams.Synchronization signal blocks which are temporally adjacent or close toeach other constitute a synchronization signal block group. A pluralityof synchronization signal block groups capable of covering all possibledownlink transmit beam directions constitute a synchronization signalblock set, as shown in FIG. 21.

It should be noted that in the example shown in FIG. 21, adjacentsynchronization signal blocks use downlink transmit beams with adjacentdirections. In an actual system, downlink transmit beams withnon-adjacent directions can be used for temporally adjacentsynchronization signal blocks according to the network deploymentsituation.

A broadcast channel in a synchronization signal block transmits aprimary information block carrying necessary information for a terminalto access a network, and the primary information block carries a systeminformation block including Remaining Minimum System Information (RMSI).Configuration information of the terminal for random access carried inthe RMSI or Other System Information (OSI), includes random accesschannel configuration information, random access preamble poolconfiguration information, and other necessary configurationinformation.

The random access channel consists of multiple random access occasions,one of them is used for transmitting a random access preamble, anddifferent random access occasions correspond to differentsynchronization signal blocks, which are used to indicate the downlinktransmit beam required by the base station. Different synchronizationsignal blocks may correspond to the same or different random accessoccasions. If multiple synchronization signal blocks correspond to thesame random access occasion, it is necessary to adopt a grouping ofrandom access preamble to distinguish different synchronization signalblocks.

Information carried in the RMSI or OSI to which differentsynchronization signal blocks are directed is the same as each other,that is, configuration information of all random access occasion needsto be carried in the RMSI or OSI.

Different synchronization signal blocks can adopt different transmitpowers to be suitable for the coverage requirements in differentdirections. When the terminal transmits the random access preamble, theterminal computes the path loss in the coverage area of the downlinkbeam based on the difference between the received reference signalreceiving power of the synchronization signal block (such as thereference signal receiving power of the primary synchronization signalor the secondary synchronization signal) and the transmit power of thebase station synchronization signal block, and then computes thetransmit power of the random access preamble. Therefore, when differentsynchronization signal blocks adopt different transmit powers, the basestation needs to configure and inform the transmit powers, thus theterminal is able to compute the path loss. Possible transmit powernotification ways are as follows:

1. directly configuring and informing transmit power levels used bydifferent synchronization signal blocks in the RMSI or OSI.Specifically, the quantized transmit power is used to configure andinform the transmit power of the synchronization signal block. As aspecific example, a bit number k for quantizing the transmit power ispreset, that is, the transmit power of each synchronization signal blockis represented by k bits. Assuming that M synchronization signal blocksare configured in the system, the transmit powers of these Msynchronization signal blocks are notified in the RMSI or OSI, and MKbits are used for configuring and informing. That is, powerconfiguration parameters are defined as follows:

-   -   power configuration parameters: [power 0, power 1, . . . , power        M−1]

wherein the power i (0≤i≤m−1) is the transmit power of the ithsynchronization signal block, represented by k bits.

The notification accuracy in this way is related to the quantization bitnumber K. The larger k is, the greater the overhead is required toinform the transmit power of each synchronization signal block, but thehigher the transmit power accuracy is.

In addition to directly configuring and informing the quantized transmitpower level, another configuring and informing way is to configure andinform the transmit power level by using an index table. A possiblelook-up table is shown in Table 5.

TABLE 5 transmit power configuration Power configuration Index (dBm) 048 1 47 2 46 3 45 . . . . . .

In the example shown in Table 5, the terminal determines the transmitpower of the synchronization signal block through the relationshipbetween the index and the power configuration, and computes the pathloss corresponding to the synchronization signal block accordingly.

2. if the difference between transmit powers of differentsynchronization signal blocks is small, the transmit powers of thedifferent synchronization signal blocks can be notified and configuredby means of power transmitting reference+power fluctuation.Specifically, the reference transmit power is configured in the RMSI orOSI, and m-bit configuration is adopted. In addition, power fluctuationconfiguration information is configured in the RMSI or OSI to inform thepower fluctuation parameters of the transmit power of eachsynchronization signal block with respect to the reference transmitpower. Considering that the fluctuation of the transmit power ofdifferent synchronization signal blocks will not be too large ingeneral, this portion is used to inform that the power fluctuationparameters with respect to the reference transmit power will not be toolarge. For example, 2 to 3 bits are used to inform the power fluctuationwith respect to the reference transmit power, as shown in the followingtable:

TABLE 6 Configuration of power fluctuation parameters Power fluctuationIndex parameter (dB) 0 −3 1 −1 2 1 3 3

The example shown in Table 6 is a notification for power fluctuationwith 2 bits. It should be noted that each synchronization signal blockneeds to adopt these 2-3 bits to configure the power fluctuationparameters of the synchronization signal block. Therefore, the totaloverhead for informing the power fluctuation parameter configuration is2-3 bits multiplied by the number of synchronization signal blocks. Theoverhead for informing the synchronization signal block of the transmitpower is the sum of the overhead of the above power fluctuationparameter configuration and the configuration bits of the referencetransmit power.

For the reference transmit power, it will be more simple and convenientto be notified by defining several preset transmit powers andconfiguring and informing them by index. An index representation isshown in Table 7.

TABLE 7 Reference transmit power configuration Index Reference transmitpower (dBm) 0 46 1 40 2 23 . . . . . .

The terminal computes the downlink transmit power of the correspondingsynchronization signal block according to the received referencetransmit power and the power fluctuation parameters of the correspondingsynchronization signal block. For example, if the reference transmitpower received by the terminal is 46 dBm and the corresponding powerfluctuation parameters of the synchronization signal block selected bythe terminal is 1 dB, the transmit power of the synchronization signalblock is 46 dBm+1 dB=47 dBm. The terminal will compute the path lossaccording to the transmit power, and then compute the transmit power forthe random access preamble.

In addition, it should be noted that as specific example of the presentmethod, the fixed reference transmit power is known by both the basestation and the terminal, thus notification and configuration is notrequired. It is only need to configure the power fluctuation parameters.The configuration of the power fluctuation parameters can refer to theabove Table 6, and the index table is adopted to inform the index of thepower fluctuation parameters, etc.

3. the base station groups synchronization signal blocks with the sameor similar downlink transmit power, and transmits them on adjacenttime-frequency resource blocks. Synchronization signal blocks onadjacent time-frequency resource blocks adopt approximately the sametransmit power, that is, synchronization signal blocks are grouped,different synchronization signal blocks in a group adopt approximatelythe same transmit power, and synchronization signal blocks among groupscan adopt different or approximately different transmit powers. Itshould be noted that since there is a configuration way ofsynchronization signal block groups in the configuration ofsynchronization signal blocks, a group of synchronization signal blockswith approximately the same transmit power can be configured in onesynchronization signal block group, or several groups of synchronizationsignal blocks can be configured in the same synchronization signal blockgroup, so as to facilitate configuration. The above two examples areshown in FIG. 22.

In this FIG. 22, synchronization signal blocks with approximately thesame transmit powers are configured to be transmitted on adjacenttime-frequency resources to constitute a power group. Anotherpossibility is that there are more synchronization signal blocks withapproximately the same transmit power in a power group, at this time,synchronization signal blocks in multiple synchronization signal blockgroups can be set as one power group.

In RMSI or OSI, the synchronization signal blocks in the power group andthe transmit power of the corresponding power group are uniformlyconfigured. In the configuration notification, the configuration methodof this power group is included. One possible configuration andnotification way is to configure and inform the number of power groups,the synchronization signal block index contained in each power group,and the configuration of downlink transmit power in each power group.

The configuration parameters in each power group are: {synchronizationsignal block index sequence, transmit power configuration information}.wherein the synchronization signal block index sequence is a sequenceconsists of indexes corresponding to synchronization signal blocks usingthe same transmit power in the power group. wherein the index of thesynchronization signal block is a logical index of the synchronizationsignal block or a synchronization signal block index characterized by atime index, such as a subframe index, a slot index or a mini slot index.The configuration of transmit power can adopt two configurationsdescribed above, namely, the transmit power of each power group can bedirectly quantized and notified. Alternatively, configuring andinforming the reference transmit power and the power fluctuationparameters of each power group may be with respect to the referencetransmit power.

If the number of synchronization signal blocks contained in differentpower groups is different, it is necessary to increase the numberinformation of synchronization signal blocks contained in the powergroups in the configuration parameters of the power groups. At thistime, the configuration parameters of each power group are: {number ofsynchronization signal blocks, synchronization signal block indexsequence, transmit power configuration information}.

If the definition of the power group matches the definition of thesynchronization signal block group, that is, the synchronization signalblock group contains a complete power group, the transmit power can beconfigured for the synchronization signal block group. The configurationand notification of the transmit power can adopt the above two ways.

If one power group includes multiple synchronization signal blockgroups, the synchronization signal block index in the configurationparameters of the power group can be modified to the synchronizationsignal block group index, and the transmit power levels of the multiplesynchronization signal block groups can be configured at the same time.

Another power group notification and configuration way is to configureand inform only the transmit power configuration information of eachsynchronization signal block group in the power group, that is, toinform the power configuration parameter sequence, and the terminaldetermines the selected transmit power configuration way according to acertain criteria. One possible way is that the terminal determines thecorresponding configuration parameters in the power configurationparameter sequence according to a preset criteria and the number ofsynchronization signal block groups or the number of synchronizationsignal blocks. Specifically, the sequence of power configurationparameters in the RMSI or OSI is {P0, . . . , PN−1}, there are Nelements in this sequence, and each element represents a powerconfiguration parameter. For the synchronization signal block with thesynchronization signal block index ISS, the index of its correspondingpower configuration parameter in the notification power configurationparameter sequence is n=mod(Iss, N).

That is, the power configuration parameters selected by the terminal isPn.

Another way to choose power configuration parameters is that forsynchronization signal blocks with synchronization signal block indexISS, the index of corresponding power configuration parameters in thenotification power configuration parameter sequence is n=└I_(ss)/N┘.

In this embodiment, the terminal side behavior can be briefly describedas follows:

The terminal performs an initial access process, detects asynchronization signal block, and reads the content of the maininformation block carried by the broadcast channel. According to thereceived power of the detected reference signal, a suitablesynchronization signal block is determined based on a preset criteria.

Reading RMSI or OSI indicated by the main information block, acquiringrandom access channel configuration information therein, and determiningtime-frequency resources of a random access occasion and a random accesspreamble according to the random access channel configurationinformation.

According to the synchronization signal block power configurationinformation in the RMSI or OSI, the transmit power of the selectedsynchronization signal block is acquired, and the path loss is computedaccording to the measured reference signal receiving power of thesynchronization signal block. The path loss is computed as follows: Pathloss (dB)=transmit power (dBm)-reference signal receive power (dBm).

The terminal determines the transmit power of the random access preambleaccording to the path loss, and transmits the determined random accesspreamble in the random access channel determined in the foregoing step.

The above process can be described with reference to FIG. 23. Whereinthe predetermined criteria for determining a suitable synchronizationsignal block may include: 1. selecting a synchronization signal blockaccording to the reference signal receiving power of the synchronizationsignal block. For example, selecting a synchronization signal block withthe largest reference signal receiving power, or randomly selecting asynchronization signal block with the equivalent probability among thesynchronization signal blocks with the reference signal receiving powerhigher than the threshold according to a predetermined threshold or athreshold configured by base station, and if there is no synchronizationsignal block, the reference signal receiving power of which is higherthan the threshold, selecting the synchronization signal block with thelargest reference signal receiving power. 2. computing the path loss ofthe synchronization signal block according to the reference signalreceiving power of the synchronization signal block and the maininformation block in the broadcast channel, or the transmit powerinformation of the synchronization signal block carried in the RMSI orOSI, and selecting the synchronization signal block according to thepath loss. For example, selecting the synchronization signal block withthe smallest path loss, or selecting the synchronization signal blockwith the path loss lower than the threshold according to a predeterminedthreshold, from which one synchronization signal block is selected withthe equivalent probability. If there is no synchronization signal blockwith the path loss lower than the threshold, selecting thesynchronization signal block with the smallest path loss.

It should be noted that in this embodiment, the transmit powerinformation of the synchronization signal block can also be transmittedin OSI.

Embodiment 4

In this embodiment, a method for configuring a transmit power of arandom access preamble will be introduced in combination with a specificsystem. In this implementation, the purpose of informing differentsynchronization signal blocks of different transmit powers is achievedby configuring the reference transmit power of the preamble, so that theterminal can select the appropriate transmit power of the random accesspreamble when selecting a specific synchronization signal block.

Specifically, the transmit power configuration of synchronization signalblocks is transmitted in the RMSI or OSI. The transmit powerconfiguration may be a rough configuration. At the same time, in therandom access configuration information, the target receiving powerconfiguration for the random access occasion is carried. By adjustingthe transmit power of synchronization signal blocks and the targetreceive power of the random access occasion, the base station canconfigure different synchronization signal blocks to adopt differenttransmit powers, and at the same time, it is ensured that the terminalcan correctly estimate the path loss of different synchronization signalblocks.

Specifically, configuration information of transmit power ofsynchronization signal blocks is transmitted in the RMSI or OSI.Possible ways are:

1. configuring and informing the transmit power of each synchronizationsignal block by quantization or an index. The transmit power of eachsynchronization signal block can be notified directly, or the referencetransmit power can be notified by preset or notified in the RMSI or OSI,and the power fluctuation parameters of each synchronization signalblock can be notified. Wherein the reference transmit power can bedetermined in a preset way, and may also be configured in the RMSI orOSI.

2. dividing synchronization signal blocks with similar transmit powersinto one group, and uniformly configuring and informing the transmitpowers of synchronization signal blocks in the group by grouping. Thesynchronization signal blocks in the group are configured in a unifiedway, and the configuration way may adopt direct notification of thetransmit power configuration, may adopt the index table to inform thetransmit power configuration in the group, or may adopt theconfiguration way of reference transmit power+power fluctuationparameters to configure the transmit power, wherein the referencetransmit power can be determined in a preset way, or can be configuredin the RMSI or OSI.

In way 2, the configuration way of grouping can adopt the way adopted inEmbodiment 3. It is simpler to group synchronization signal blocksaccording to the configuration of the synchronization signal blockgroup, that is, the synchronization signal blocks which can beconfigured with the same transmit power are placed in adjacent locationsto constitute the synchronization signal block group. In this way, eachsynchronization signal block configuration is suitable for the transmitpower of each synchronization signal block in the synchronization signalblock group.

Configuring different initial target preamble receiving powers in randomaccess configuration information for different random access occasionscorresponding to different synchronization signal blocks, computing thepreamble receiving target powers according to the initial targetpreamble receiving powers, and computing the transmit powers of therandom access preambles in conjunction with path loss. Specifically,combining the actual transmit power with the transmit power configuredin the RMSI or OSI, the initial target preamble receiving power isconfigured. A simple example is that the expected receiving power of thepreamble of the base station is −110 dBm, and the transmit power of thesynchronization signal block configured in the RMSI or OSI is 45 dBm.However, as the configuration of the transmit power is relatively rough,the transmit power of the synchronization signal block selected by theterminal is different from that configured in the RMSI or OSI, which ishigher than the configured transmit power by 1 dB. Therefore, whenconfiguring the receiving power of the initial target preamble, theconfiguration is −111 dBm, that is, the configured receiving power ofthe initial target preamble is 1 dB lower than that of the expectedpreamble.

It should be noted that different random access occasions correspondingto different synchronization signal blocks may configure differentinitial target preamble receiving powers. Specifically, one possibleconfiguration way is to configure the initial target preamble receivingpower sequence according to the index order of the synchronizationsignal blocks, and each element in the sequence indicates theconfiguration value of the initial target preamble receiving power ofthe random access occasion corresponding to the corresponding indexedsynchronization signal block. For example, for a system with eightsynchronization signal blocks, when configuring the initial targetpreamble receiving power sequence of random access occasioncorresponding to these eight synchronization signal blocks, the sequencecontaining eight elements should be configured, for example: Thereceiving power of the initial target preamble is:{a0,a1,a2,a3,a4,a5,a6,a7}. wherein the unit of ai is dBm, whichindicates the initial target preamble receiving power configured by therandom access occasion corresponding to the ith synchronization signalblock, 0≤i≤7.

For the case that multiple synchronization signal blocks correspond tothe same random access occasion, the configuration of the initial targetpreamble receiving power can still be carried out according to the aboveway. Another configuration way is to configure the initial targetpreamble receiving power for the random access occasion. Specifically,when configuring time-frequency resources of the random access occasion,the initial target preamble receiving power of each random accessoccasion is configured at the same time. Alternatively, numbering indexof random access occasions is performed according to a preset criteria,and the target preamble receiving power sequence is configured accordingto the number of random access occasions, and the elements in thesequence are the configuration of the target preamble receiving power ofthe corresponding random access occasion. A simple example is that thebase station configures eight random access occasions, the configuredtarget preamble receiving power sequence length is 8, and the sequenceis {b0,b1,b2,b3,b4,b5,b6,b7}, wherein the unit of bi is dBm, whichindicates the initial target preamble receiving power configured by theith random access occasion, 0≤i≤7.

Similar to the way in which the transmit power is configured by groupingsynchronization signal blocks in Embodiment 3, the transmit power canalso be configured by grouping synchronization signal blocks or randomaccess occasions. Specifically, synchronization signal blocks configuredwith approximately the same transmit power or approximately the sameinitial target preamble receiving power are arranged in adjacentlocations, and the grouping method and the initial target preamblereceiving power of each group are configured in the RMSI or OSI. Onepossible way is to configure synchronization signal block grouping byway of an index sequence. One possible way is to transmit groupinginformation or information of index sequences in each group in the RMSIor OSI. A simple example is that the information required for groupinginformation includes:

-   -   number of groups    -   group 1: {intra-group synchronization signal block index};    -   group 2: {intra-group synchronization signal block index};    -   group n: {intra-group synchronization signal block index}.

Another way of grouping is to inform only the transmit powerconfiguration of each group, that is, to inform the power configurationparameter sequence, and the terminal determines the way of selectedtransmit power configuration according to a certain criteria. Onepossible way is that the terminal determines the correspondingconfiguration parameters in the power configuration parameter sequenceaccording to a preset criteria and the number of groups or the number ofsynchronization signal blocks. Specifically, the sequence of powerconfiguration parameters in the RMSI or OSI is {P0, . . . , PN−1}, thereare N elements of the power sequence, and each element represents onepower configuration parameter. For the synchronization signal block withthe synchronization signal block index ISS, the index, of thecorresponding power configuration parameters, in the power configurationparameter sequence is n=mod(Iss, N).

That is, the power configuration parameter selected by the terminal isPn.

Another way to choose power configuration parameters is, for thesynchronization signal block with the synchronization signal block indexISS, the index, of the corresponding power configuration parameters, inthe power configuration parameter sequence is n=└I_(ss)/N┘.

The grouping method and the notification and configuration way of powercan be used in combination. A simple example is to configure thetransmit power of the synchronization signal block group with thesynchronization signal block group, that is, each synchronization signalblock in the same synchronization signal block group adopts the sametransmit power configuration. At the same time, informing or configuringfurther grouping, or configuring the initial target preamble receivingpower of the synchronization signal block, inside the synchronizationsignal block group.

When adopting the method provided in the above embodiment, the behaviorof the terminal side can be briefly described as follows:

The terminal performs the initial access process, detects thesynchronization signal block, and reads the content of the maininformation block carried by the broadcast channel. Determining asuitable synchronization signal block according to the received power ofthe detected reference signal and the predetermined criteria.

Reading the RMSI or OSI indicated by the main information block,acquiring random access channel configuration information therein, anddetermining time-frequency resources of the random access occasion andthe random access preamble according to the random access channelconfiguration information.

Acquiring the transmit power of the selected synchronization signalblock according to the synchronization signal block power configurationinformation in the RMSI or OSI, and computing the path loss according tothe measured reference signal receiving power of the synchronizationsignal block. The path loss is computed as: path loss (dB)=transmitpower (dBm)-reference signal receive power (dBm).

The terminal computes the preamble target receiving power according tothe configuration information of the initial target preamble receivingpower in the random access configuration information and the informationsuch as a random access power ramping counter. In combination with thecomputed path loss, the transmit power of the preamble can be acquired.Using this transmit power, the determined random access preamble istransmitted in the random access channel determined in the previousstep.

Wherein the predetermined criteria for determining suitablesynchronization signal blocks may include: 1. selecting asynchronization signal block according to the reference signal receivingpower of the synchronization signal block. For example, selecting asynchronization signal block with the largest reference signal receivingpower, or randomly selecting a synchronization signal block with theequivalent probability among the synchronization signal blocks with thereference signal receiving power higher than the threshold, according toa predetermined or a threshold configured by base station, and if thereis no synchronization signal block, the reference signal receiving powerof which is higher than the threshold, selecting the synchronizationsignal block with the largest reference signal receiving power. 2.computing the path loss of the synchronization signal block according tothe reference signal receiving power of the synchronization signal blockand the primary information block in the broadcast channel, or thetransmit power information of the synchronization signal block carriedin the RMSI or OSI, and selecting the synchronization signal blockaccording to the path loss. For example, selecting the synchronizationsignal block with the smallest path loss, or selecting thesynchronization signal block with the path loss lower than the thresholdaccording to a predetermined threshold, from which one synchronizationsignal block is selected with the equivalent probability. If there is nosynchronization signal block, the pass loss of which is lower than thethreshold, selecting the synchronization signal block with the smallestpath loss.

In addition, the preamble target receiving power is computed as follows:

PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTargetPower_k+DELTA_PREAMBLE+(POWER_RAMPING_COUNTER−1)*powerRampingStep;

wherein PREAMBLE_RECEIVED_TARGET_POWER is the computed preamble targetreceiving power, preambleInitialReceivedTargetPower_k is the initialtarget preamble receiving power configured in the kth selectedsynchronization signal block, DELTA_PREAMBLE is the power controlparameters related to the preamble format, POWER_RAMPING_COUNTER is thepower ramping counter, which is used to record the number of powerrampings, and powerRampingStep is the power ramping compensation, whichis configured in the random access configuration information.

After acquiring the preamble target receiving power, the transmit powerfor transmitting the random access preamble is computed according to themaximum transmit power limit and the power loss, as follows:

PPRACH=min{PCMAX,PREAMBLE_RECEIVED_TARGET_POWER+PL k} [dBm]

wherein PCMAX is the maximum transmit power of the terminal and PLk isthe computed path loss of the kth synchronization signal block.

It should be noted that the random access configuration information(including random access channel configuration information, preambleresources and initial target preamble receiving power configurationinformation) in this embodiment is transmitted in an Media AccessControl (MAC) layer. After the MAC computes the receiving power of thetarget preamble, the target preamble is transmitted to the physicallayer, and the physical layer computes the final transmit power forrandom access preamble transmitting.

For the case where the power ramping counter is larger than 1, that is,for the case where the previous random access attempt fails and therandom access process attempt is re-initiated, it is necessary to firstdetermine whether it is necessary to switch the time-frequency resourcesof the random access occasion according to the latest measurementresult. Specifically, the terminal determines whether the currentlyselected synchronization signal block still meets the predeterminedsynchronization signal block selection criteria according to the latestmeasurement result. For example, a predetermined threshold is set, andif the reference signal receiving power is lower than the threshold, itis deemed that the synchronization signal block is no longer suitable,and the synchronization signal block is re-selected according to theforgoing criteria; or, a predetermined criterion is set, if the computedpath loss is higher than the threshold, it is deemed that thesynchronization signal block is no longer suitable, and thesynchronization signal block is re-selected according to the forgoingcriterion.

If the synchronization signal block is re-selected when the randomaccess is re-attempted, it is necessary to re-select the time-frequencyresources and preamble resources of the random access occasion accordingto the configuration information (including the random accessconfiguration information and the transmit power configurationinformation) of the synchronization signal block, and re-compute thetransmit power of the random access preamble, and transmit the preambleusing the re-computed transmit power of the random access preamble onthe re-selected random access occasion.

It should be noted that in this embodiment, the transmit powerinformation, random access configuration information and other randomaccess related configuration information of the synchronization signalblock can also be transmitted in OSI.

Embodiment 5

In this embodiment, a method for configuring a transmit power of arandom access preamble will be introduced in combination with a specificsystem. In this embodiment, the transmit power of the random accessoccasion corresponding to synchronization signal blocks with differenttransmit powers is adjusted by configuring power control parameters.

One possible implementation is to carry power control parameters inrandom access configuration information, and synchronization signalblocks with different transmit powers are configured with differentpower control parameters, which are used to adjust path loss computationof different random access occasions.

Specifically, the power control parameters are carried in the randomaccess configuration information to adjust the transmit power of therandom access preamble. In this embodiment, the indication of thetransmit power of the synchronization signal block can still betransmitted in the RMSI or OSI, for example, in the way adopted in theprevious embodiment. The difference is that in this embodiment, theindication of the transmit power of the synchronization signal block canadopt a rough configuration way. For example, using only two bits toindicate the transmit power of the synchronization signal block orinforming the configuration and indication of the transmit power of thesynchronization signal block within a larger group.

The initial target preamble receiving power parameters carried in therandom access configuration information can still be configuredaccording to the synchronization signal block, synchronization signalblock grouping or random access timing grouping in the way described inEmbodiment 4. The difference is that it is possible to adopt a roughconfiguration way, for example, a configuration way with a largerquantization interval or a configuration way with more synchronizationsignal blocks in the group.

At the same time, the random access configuration information carriespower configuration parameters. This parameter can be configured on asynchronization signal block, that is, different synchronization signalblocks are configured with the same or different power configurationparameters. An index table can be used for configuration. A simpleexample is shown in Table 8.

TABLE 8 schematic diagram of power control parameters Index Powercontrol parameter (dB) 0 −3 1 −1 2 0 3 1

The index table are both known by the terminal and the base station, andthe base station configures corresponding power control parameters byinforming the index, and the terminal obtains the power controlparameters corresponding to the corresponding index by looking up thetable.

In other configuration ways, the configuration of power controlparameters is performed in a direct quantization way, that is, thequantization of power control parameters at certain quantizationintervals is adopted, and the quantized power control parameters areconfigured.

This configuration parameter can be transmitted in the RMSI or OSI or inrandom access configuration information in the way of parametersequence. That is, a parameter sequence having a length consistent withthe number of synchronization signal blocks is established, wherein eachelement represents the power control parameters of the synchronizationsignal block configuration of the corresponding index. A simple exampleis to set up a parameter sequence with a length of 8 for a system with 8synchronization signal blocks: [c0, . . . , c7], wherein c1, 0≤i≤7 isthe power control parameters of the ith synchronization signal block.

Adopting the way that each synchronization signal block is configuredmay cause a larger signaling overhead. In addition to configuring powercontrol parameters independently for synchronization signal blocks,another possibility is to group synchronization signal blocks andconfigure power control parameters in the way of grouping. The way ofgrouping can refer to the way described in Embodiment 3 or Embodiment 4.

The parameters added in this embodiment can be used to compute thetarget receiving power in the MAC layer, or transmitted to the physicallayer for directly adjusting the transmit power of the random accesspreamble.

If the target receiving power is computed in MAC layer, theconfiguration information provided in the RMSI or OSI includes thetarget receiving power adjustment parameters to adjust the targetreceiving power computed in MAC layer, thus indirectly adjusting thepath loss computed by the terminal. Specifically, assuming that thetarget receiving power adjustment parameter is expressed byAdjust_Preamble_Power, the computation formula of the target receivingpower of the MAC is:

PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTargetPower+DELTA_PREAMBLE+(POWER_RAMPING_COUNTER−)*powerRampingStep+Adjust_Preamble_Power;

In the above formula, the parameter preambleInitialReceivedTargetPowercan be notified on the synchronization signal block, or can beconfigured and notified according to the grouping of synchronizationsignal blocks. Similarly, the parameter Adjust_Preamble_Power can alsobe notified on the synchronization signal block, or can be configuredand notified according to the grouping of synchronization signal blocks.The preamble target receiving power is obtained by computing the aboveparameters, which is transmitted to the physical layer by the MAC layer,and the transmit power of the random access preamble is computed bycombining the computed path loss.

If the transmit power of the random access preamble is adjusted in thephysical layer, the configuration information provided in the RMSI orOSI includes the transmit power adjustment parameters of the preamble,which needs to be transmitted to the physical layer through a higherlayer, and the transmit power of the random access preamble is adjustedby the physical layer. Specifically, the preamble target receiving powercomputed by the MAC layer is transmitted to the physical layer, and thephysical layer computes the path loss according to the measurementresults, high-layer transmitting or the preset transmit power of thesynchronization signal block, and computes the transmit power of therandom access preamble according to the power adjustment parameters. Thespecific formula is described as follows:

PPRACH=min{PCMAX,PREAMBLE_RECEIVED_TARGET_POWER+PL k+δk} [dBm]

wherein δk is the power adjustment parameter configured for the kthsynchronization signal block. The above formula assumes that theterminal selects the kth synchronization signal block and performs arandom access process on the corresponding random access occasion.

In this embodiment, the behavior of the terminal can be similar to thatof the previous embodiment, and can be briefly described as follows:

The terminal performs the initial access process, detects thesynchronization signal block, and reads the content of the primaryinformation block carried by the broadcast channel. According to thereceived power of the detected reference signal and the predeterminedcriteria, a suitable synchronization signal block is determined.

Reading the RMSI or OSI indicated by the primary information block,acquiring random access channel configuration information therein, anddetermining time-frequency resources of the random access occasion andthe random access preamble according to the random access channelconfiguration information.

According to the synchronization signal block power configurationinformation in the RMSI or OSI, the transmit power of the selectedsynchronization signal block is acquired, and the path loss is computedaccording to the measured reference signal receiving power of thesynchronization signal block. The path loss is computed as follows: Pathloss (dB)=transmit power (dBm)-reference signal receiving power (dBm).

The terminal computes the preamble target receiving power according tothe configuration information of the initial target preamble receivingpower in the random access configuration information and the informationsuch as the random access power ramping counter. Combining the computedpath loss, the transmit power of random access preamble can be acquired.Using this transmit power, the determined random access preamble istransmitted in the random access channel determined in the previousstep.

The disclosure also provides an apparatus for transmitting a randomaccess preamble, as shown in FIG. 24, which comprises:

a detection unit 2401 configured to detect a synchronization signalblock to obtain a reference signal receiving power;

a first processing unit 2402 configured to determine a targetsynchronization signal block according to the reference signal receivingpower, and acquire configuration information carried in the targetsynchronization signal block;

a second processing unit 2403 configured to determine a random accesschannel and a random access preamble according to the configurationinformation, and determine the transmit power of the random accesspreamble according to the configuration information and the referencesignal receiving power; and

a transmit unit 2404 configured to transmit the random access preambleon the random access channel according to the transmit power.

Based on the method and apparatus provided by the present disclosure,different transmit powers of different transmit beams (corresponding todifferent synchronization signal blocks) in a 5G multi-beam operatingsystem can be adapted, and different transmit powers can be configuredwith a lower signaling overhead, thereby improving system flexibilityand terminal experience.

It should be understood by a person of ordinary skill in the art thatterm “terminal” and “terminal apparatus” as used herein include not onlyapparatuses with a wireless signal receiver having no emissioncapability but also apparatuses with receiving and emitting hardwarecapable of carrying out bidirectional communication over a bidirectionalcommunication link. Such apparatuses can include cellular or othercommunication apparatuses with a single-line display or multi-linedisplay or the same without a multi-line display; Personal CommunicationService (PCSs) with combined functionalities of speech, data processing,facsimile and/or data communication; Personal Digital Assistants (PDAs),which can include RF receivers, pagers, internet/intranet accesses, webbrowsers, notepads, calendars and/or Global Positioning System (GPS)receivers; and/or conventional laptop and/or palmtop computers or otherapparatuses having and/or including a RF receiver. The “terminal” and“terminal apparatus” as used herein may be portable, transportable,mountable in transportations (aviation, marine and/or landtransportations), or suitable and/or configured to run locally and/ordistributed in other places in the earth and/or space for running. The“terminal” or “terminal apparatus” as used herein may further be acommunication terminal, an internet terminal, a music/video playerterminal. For example, the terminal may be a PDA, a Mobile InternetDevice (MID) and/or a mobile phone with a music/video playback function,or may be apparatuses such as a smart TV and a set-top box.

On the one hand, in the existing 5G standard discussion, thecommunication system uses a beamforming method. In this method, after aplurality of users read same random access response(s), they willtransmit the Msg3 on a same uplink resource, and in terms of thereceiving end (i.e., the base station), it is possible to decode theMsg3 of the plurality of users successfully and obtain different UE IDs(i.e., user equipment unique identifiers) for the plurality of users. Ina traditional communication system, the base station can only transmit acontention resolution message for a single user in message 4, that is,the base station can only access one user. After the user successfullysearches for and decodes message 4, it is determined that the UE IDwhich is the same as the UE ID uploaded in Msg3, then, the access isconsidered to be successful, a Temporary Cell-Radio Network TemporaryIdentifier (TC-RNTI) is set as the C-RNTI, and an acknowledgment istransmitted to the base station. If it is necessary to support access bymultiple users in message 4, the problems to be solved include how tosolve the allocation of C-RNTI, how to indicate the resource indicationfor feeding back an uplink ACK for message 4, and the like.

Based on the foregoing technical problems to be solved, the Embodiment 6of the present disclosure provides a random access method. Based on therandom access method provided in the Embodiment 6 of the presentdisclosure, after a user reads a random access response and transmits amessage 3, the TC-RNTI obtained in the random access response is used todetect the downlink control information. When an ACK message transmittedby the base station is received, the ACK message indicates that the basestation successfully receives the user's message 3, and the UE will findthe message 4 transmitted by the base station, and find thecorresponding Control Element (MAC CE) carrying the UE ID uploaded bythe user in message 3 from the Medium Access Control Protocol Data Unit(MAC PDU). In order to correspond to the UE IDs of different users, itis necessary to allocate C-RNTIs for different users and indicate theuplink resource position for subsequent transmitting ACKs in the message4. Specifically, the new C-RNTI and the uplink resource indication ofthe ACK may be notified to the user by expanding or adding the MAC CE,or the Service Data Unit (SDU) in the message 4 may carry the foregoinginformation.

Specifically, the flowchart of the random access method provides by theEmbodiment 6 of the present disclosure is as shown in FIG. 26, and themethod includes: Step 2610: random access response(s)(RAR(s)) istransmitted to a plurality of UEs, based on received preamblestransmitted by the plurality of UEs; Step 2620: Msg3(s) transmitted bythe plurality of UEs is received; and Step 2630: the contentionresolution message is transmitted to the plurality of UEs, based onreceived Msg3(s) transmitted by the plurality of UEs.

The embodiment of the present disclosure provides a random accessmethod. The random access method includes: RAR(s) is transmitted to aplurality of UEs, based on received preambles transmitted by theplurality of UEs; Msg3(s) transmitted by the plurality of UEs isreceived, which provides necessary guarantees for subsequenttransmitting of a contention resolution message to the plurality of UEs;and a contention resolution message is transmitted to the plurality ofUEs, based on the received Msg3 transmitted by the plurality of UEs. Themethod can enable the base station to transmit the contention resolutionmessage to the plurality of different UEs at the same time. The methodprovides a reliable guarantee for multiple users to access the basestation and perform data transmission at the same time based on thereceived contention resolution message, and effectively avoids thesituation that the base station transmits the contention resolutionmessage to only one user and only one user is accessed thereto.

Preferably, the transmitting of the contention resolution message to theplurality of UEs includes transmitting of the contention resolutionmessage to the plurality of UEs through the MAC PDU; the contentionresolution message includes UE contention resolution identities of theplurality of UEs and/or C-RNTI and/or HARQ feedback resource indicationallocated for UEs.

Preferably, the transmitting of the contention resolution message to theplurality of UEs through the MAC PDU includes at least one of thefollowing situations:

transmitting of the contention resolution message to the plurality ofUEs by carrying the UE contention resolution identities of the pluralityof UEs and/or the C-RNTI and/or the HARQ feedback resource indicationallocated for the plurality of UEs in a MAC CE of the MAC PDU;

transmitting of the contention resolution message to the plurality ofUEs by carrying the plurality of UE contention resolution identities ofthe plurality of UEs in the first MAC CE of the MAC PDU and carrying theC-RNTI and/or the HARQ feedback resource indication allocated for theplurality of UEs in a second MAC CE of the MAC PDU;

transmitting of the contention resolution message to the plurality ofUEs by carrying the plurality of UE contention resolution identities ofthe plurality of UEs in the MAC CE of the MAC PDU and carrying theC-RNTI and/or the HARQ feedback resource indication allocated for theplurality of UEs in a MAC SDU of the MAC PDU.

Preferably, the second MAC CE is subsequent to and adjacent to the firstMAC CE.

Further, in the Embodiment 6 of the present disclosure, in order tocorrespond to the UE IDs of different users, it is necessary to allocateC-RNTIs for different users and to indicate the uplink resource positionfor subsequent transmitting ACKs in the message 4. Embodiment 6 caninclude the following the implement manners:

First, only the format of the MAC CE is modified. As shown in FIG. 27,the UE reads the MAC PDU subheader, wherein, if the logical channelidentifier (LCID) indicates the MAC CE type corresponding to the user is“UE Contention Resolution Identity”, the UE needs to determine whetherthe UE contention resolution identity contained in content of the MAC CEis matched with the UE ID in message 3 transmitted by the user when theuser reads the content of the MAC CE. Wherein,

a) If they are matched, the user uses the allocated C-RNTI obtained fromthe MAC CE as the C-RNTI used after accessing the network itself; UEreads the HARQ feedback resource indication therefrom to determine theresource for transmitting the uplink HARQ feedback, and transmits an ACKsignal. The ACK/NACK (Acknowledgment/Non-Acknowledgment) resourceindication includes the position of the time-frequency resource fortransmitting the uplink HARQ feedback, and the sequence number of thepossible sequence, similar to the sequence number of computer-generatedsequence (CGS) used in LTE.

b) If they are not matched, then the user contention resolution isfailed. If the maximum number of random access preamble transmissions isnot exceeded, the user continues to transmit message 1 and continues therandom access process.

Secondly, a MAC CE is added, that is, the user reads the LCID indicatingthe “UE contention resolution identity” and the LCID indicating the“allocated C-RNTI and/or HARQ feedback resource indication” respectivelyin the subheader of the MAC PDU, and corresponding information is foundin the corresponding MAC CE; as shown in the Table 9, except for theLCID index corresponding to the UE contention resolution identity, aseparate LCID index is newly added for “the allocated C-RNTI and/or HARQfeedback resources indication”, and 01011 in the table is an example. Itcan also be other values.

TABLE 9 The values of LCID of the downlink sharing channel Index LCIDvalue . . . . . . 11100 UE contention resolution identity 01011Allocated C-RNTI and/or HARQ feedback resources indication . . . . . .

In the example of FIG. 28, the user reads the LCID of “UE contentionresolution identity” and the LCID of “allocated C-RNTI and/or HARQfeedback resource indication” in the MAC header and reads thecorresponding value in the corresponding MAC CE. If the read UEcontention resolution identity by user matches the UE ID transmitted inmessage 3 by itself, then it is considered that the contentionresolution is successful and UE reads “allocated C-RNTI and/or HARQfeedback resources indication” in the next MAC CE that follows, to setits own C-RNTI and obtain the HARQ feedback resource indication.

Third, the “allocated C-RNTI and/or HARQ feedback resource indication”is directly added into the UE's MAC SDU.

The difference between the third manner and the first manner is that inthe third manner, the “allocated C-RNTI and/or HARQ feedback resourceindication” isn't carried in the MAC CE, but be added into the other MACSDUs of the user.

On the other hand, in the new communication system standard discussion,the communication system uses a beamforming method. In this method,after a plurality of users read a same random access response, they willtransmit Msg3(s) on a same uplink resource, and in terms of thereceiving end (i.e., the base station), it is possible to decode theMsg3 of the plurality of users successfully and obtain different UE IDs(i.e., UE unique identifiers) for multiple users. In a traditionalcommunication system, the base station can only transmit a contentionresolution message for a single user in message 4, that is, the basestation can only access one user. After the user initial accessedsuccessfully searches for and decodes message 4, it is determined thatthe UE ID in message 4 is the same as the UE ID uploaded in Msg3, then,the access is considered to be successful, a Temporary Cell-RadioNetwork Temporary Identifier (TC-RNTI) is set as the C-RNTI, and anacknowledgment is transmitted to the base station. After reading therandom access response and transmitting the message 3, the TC-RNTIobtained in the random access response is used to detect the downlinkcontrol information. When receiving the ACK message transmitted by thebase station (it indicates that the base station receives the message 3of the user successfully), the UE will find the message 4 transmitted bythe base station, and find the UE ID uploaded by the user in the message3 carried by the corresponding MAC CE from the MAC PDU therein. The UEID may be the SAE-Temporary Mobile Subscriber Identity (S-TMSI) of theUE, the C-RNTI, a random number, and the like.

Since the base station allocates C-RNTI and indicates an uplink resourcelocation for subsequent transmitting ACK for a plurality of differentusers, in order to correspond to UE IDs of the plurality of differentusers, the user searches for or decodes the message 4 and detectswhether the process of contention solution being successful also needsto be adjusted accordingly.

Based on this, the Embodiment 7 of the present disclosure provides arandom access method, and the specific flow is as shown in FIG. 29,including: Step 2910, a Msg3 is transmitted to a base station, based onreceived RAR corresponding to a transmitted preamble; Step 2920, acontention resolution message from the base station corresponding toMsg3 is received.

The embodiment of the present disclosure provides a random accessmethod. The random access method includes: a Msg3 is transmitted to thebase station, based on received RAR corresponding to a transmittedpreamble, which provides necessary guarantees for subsequent theplurality of UEs receiving of the contention resolution messagetransmitted by the base station; and the contention resolution messagefrom the base station corresponding to Msg3 is received. The method canenable the plurality of UEs receive the contention resolution messagetransmitted by the base station at the same time. It provides a reliableguarantee for multiple users to access the base station and perform datatransmission at the same time based on the received contentionresolution message, and effectively avoids the situation that the basestation transmits the contention resolution message to only one user andonly one user is accessed thereto.

Preferably, the method further includes: detecting of a PhysicalDownlink Control Channel (PDCCH) to determine whether a contentionresolution is successful; wherein, the way of determining whether thecontention resolution is successful includes at least one of thefollowing:

under a first preset condition, if the PDCCH information is detectedbased on the C-RNTI obtained by the UE, and the PDCCH informationincludes an uplink grant to transmit new data, it is determined that thecontention resolution is successful;

under a second preset condition, if the PDCCH information is detectedbased on the C-RNTI obtained by the UE, it is determined that thecontention resolution is successful; and

under a third preset condition, if the PDCCH information is detectedbased on temporary C-RNTI obtained by the UE, then the UE contentionresolution identity obtained based on decoded MAC PDU determines whetherthe contention resolution is successful.

Preferably, the first preset condition includes: UE carries the C-RNTIin the Msg3, and the random access process is triggered based on a MACsublayer and Radio Resource Control (RRC) sublayer;

the second preset condition includes: UE carries the C-RNTI in the Msg3,and the random access process is triggered based on a PDCCH order; and

the third preset condition includes: UE carries the UE identifier in theMsg3, and the UE identifier is reported through a Common Control ChannelService Data Unit (CCCH SDU).

Preferably, the UE contention resolution identity obtained based on thedecoded MAC PDU determines whether the contention resolution issuccessful, if the MAC PDU includes the first MAC CE for indicting theplurality of UE contention resolution identities, includes:

Detecting of whether any UE contention resolution identity in the firstMAC CE is the same as the preset number of bits of a preset position inthe CCCH SDU carried in the Msg3;

determining that the contention resolution is successful, if they arethe same; and

retransmitting the preamble, if they are not the same and not exceed amaximum transmission times of preamble.

Preferably, if the first MAC CE is also used for indicating the C-RNTIand/or the HARQ feedback resource indication allocated for the UE, afterthe determining that the contention resolution is successful, the methodfurther includes:

obtaining of the C-RNTI and/or the HARQ feedback resource indicationallocated for the UE in the first MAC CE.

Preferably, if the MAC PDU includes the first MAC CE for indicting theplurality of UE contention resolution identities and the second MAC CEfor indicating the C-RNTI and/or the HARQ feedback resource indicationallocated for the UE, after the determining of the contention resolutionbeing successful, the method further includes:

obtaining of the C-RNTI and/or the HARQ feedback resource indicationallocated for the UE in the second MAC CE.

Preferably, if the MAC PDU includes the first MAC CE for indicting theplurality of UE contention resolution identities and the MAC SDU forindicating the C-RNTI and/or the HARQ feedback resource indicationallocated for the UE, after the determining of the contention resolutionbeing successful, the method further includes:

obtaining of the C-RNTI and/or the HARQ feedback resource indicationallocated for the UE in the MAC SDU.

Preferably, the HARQ feedback resources indication includes uplinkresource configuration information, wherein, the uplink resourceconfiguration information includes at least one of the following:

a time position, a frequency-domain position and sequence information;

wherein, the time position includes any one of the following:

a time unit index, a relative position relative to a known time unitposition;

the frequency domain position includes any one of the following:

a frequency domain unit index, a relative position relative to a knownfrequency domain unit position;

the sequence information includes:

sequence index information used for generating the Physical UplinkControl Channel (PUCCH) by the UE.

Preferably, the way of detecting of the PDCCH includes any one of thefollowing:

if a negative acknowledgment message NACK is detected in the PDCCHsearch space based on the C-RNTI or the temporary C-RNTI, searching forthe uplink grant in the PDCCH search space or in a PDCCH search spaceafter the preset time interval, based on the used C-RNTI or thetemporary C-RNTI, to retransmit the Msg3;

if an acknowledgment message ACK is detected in the PDCCH search spacebased on the C-RNTI or the temporary C-RNTI, searching for PDCCHinformation carrying contention resolution message in the PDCCH searchspace or in a PDCCH search space after the preset time interval based onthe used C-RNTI or the temporary C-RNTI;

if the uplink grant for retransmitting the Msg3 is not detected in thePDCCH search space based on the C-RNTI or the temporary C-RNTI,redetecting of the PDCCH information carrying contention resolutionmessage in the PDCCH search space based on the used C-RNTI or thetemporary C-RNTI;

if the PDCCH information carrying contention resolution message is notdetected in the PDCCH search space based on the C-RNTI or the temporaryC-RNTI, redetecting of the uplink grant for retransmitting the Msg3 inthe PDCCH search space or a PDCCH search space after the preset timeinterval based on the used C-RNTI or the temporary C-RNTI.

In the following, the random access method of the embodiment of thepresent disclosure is described in detail in conjunction with theresource configuration in the message 4 of the base station. Forconvenience of description, this embodiment will be described in thecase where two UEs collide, but the way of configuration can be extendedto the case where multiple users collide or no collision.

Message 1: UE1 and UE2 select the same random access time-frequencyresource (i.e., PRACH) and select the same random access preamble(preamble1), and launch random access to the base station;

Message 2: The base station detects preamble1, but the base stationcannot confirm that the preamble1 is the result of collision of multipleUEs. It can only prepare a random access response for the preamble1 bydefault. In the random access response message, the Temporary Cell RadioNetwork Temporary Identifier (TC-RNTI) is configured for possible accessusers, as well as the timing advance information and the uplink grantfor transmitting message 3; UE1 and UE2 search the same random accessresponse message by using the same Random Access Radio Network TemporaryIdentifier (RA-RNTI). The random access radio network temporaryidentifier searches for the same random access response message. Becausethe random access preamble sequence identifiers (RAPIDs) selected by thetwo UEs are also the same, both UEs consider that the random accessresponse sent by the base station is sent to themselves, then both UEswill read the uplink grant and the timing advance contained in the RARto transmit message 3;

Message 3: In message 3, UE1 and UE2 will transmit their own UE ID tothe base station. In the beamforming system, signals arrive at the basestation through different channels, because of the different locationsof UE1 and UE2. Once the base station can decode the messages 3transmitted by UE1 and UE2 respectively, for example, when the basestation has a distributed antenna configuration, the signal of UE1received by antenna 1 is stronger, the message 3 of UE1 is decoded, andthe signal of UE2 received by antenna 2 is stronger, the message 3 ofUE2 is decoded. Therefore, on the base station side, it can beconsidered as both UEs are detected by the base station.

For the UE, after transmitting the message 3, the UE starts aMAC-Contention Resolution Timer or restarts a MAC-Contention ResolutionTimer; meanwhile, the UE needs to detect the downlink control channel,to determine whether the competition solution is successful.

The embodiments of the present disclosure provide the following multipleimplementation manners for detecting the downlink control channel:

1. The UE detects a non-acknowledgment message NACK in the downlinkcontrol channel search space by using the C-RNTI or the TC-RNTI, and theUE continues to search a possible uplink grant in the present searchspace or the next search space or a search space after a preset intervalbased on the used C-RNTI or the temporary C-RNTI, in order for theretransmission of Msg3; or,

2. The UE detects an acknowledgment message ACK in the downlink controlchannel search space by using the C-RNTI or TC-RNTI, and the UEcontinues to search a possible PDCCH carrying message 4 in the presentsearch space or the next search space or a search space after a presetinterval based on the used C-RNTI or the temporary C-RNTI; or,

3. The UE detects uplink grant for retransmission of message 3 in thedownlink control channel search space by using the C-RNTI or TC-RNTI; ifthe uplink grant is not detected, the UE redetects a possible PDCCHcarrying message 4 in the search space or a search space after a presetinterval based on the used C-RNTI or the TC-RNTI; wherein, the UE maydetect a possible PDCCH carrying message 4 in the downlink controlchannel search space by using C-RNTI or the TC-RNTI firstly, if it isnot detected, UE redetects uplink grant in the search space or a searchspace after a preset interval based on the used C-RNTI or the TC-RNTI,in order for the retransmission of Msg3.

At the same time, the manner for determining whether the contentionresolution is successful in the embodiment of the present disclosureincludes:

1. While the UE includes a C-RNTI (that is, the UE is a connected UE) inthe message 3 and the random access process is triggered by a MACsublayer or a RRC sublayer, it is determined that the contentionresolution is successful when the UE detects PDCCH informationsuccessfully including uplink grant for new data by using the obtainedC-RNTI; or,

2. While the UE includes a C-RNTI in message 3 (that is, the UE is aconnected UE) and the random access process is triggered by a PDCCHorder, it is determined that the contention resolution is successfulwhen the UE detects PDCCH information successfully by using the obtainedC-RNTI.

In both of the above cases, the UE can consider that the contentionresolution is successful; the MAC contention resolution timer can bestopped, and the Temporary C-RNTI allocated by the base station can beignored.

3. While the UE includes a UE ID reported by Common Control ChannelService Data Unit (CCCH SDU) in message 3, the PDCCH information isdetected by the obtained TC-RNTI, and a Message 4 is found, the UEdetermines that the contention resolution is successful based on thedecoded MAC PDU, when the UE successfully decodes the MAC PDU of message4, then the UE stops the MAC contention resolution timer.

Specifically, when the UE detects the PDCCH information through theTC-RNTI in the message 3, it is based on the UE contention resolutionidentity obtained by decoding the MAC PDU to determine whether thecontention resolution is successful, wherein the UE determine whetherthe competition solution is successful based on the UE contentionresolution identity obtained by decoding MAC PDU, including thefollowing situations:

1. When the MAC PDU decoded by the UE includes the MAC CE for indicatingthe UE contention resolution identity, the UE will compare the UEcontention resolution identity (N bits, such as 48 bits in LTE) in theMAC CE with the first N bits (or the last N bits, or the N bits of thespecified position) in the CCCH SDU uploaded in message 3 by the UE, asshown in FIG. 30.

a) If the comparison is positive, the UE may consider its own contentionresolution to be successful and continue to read the C-RNTI value asallocated by the base station in the same MAC CE; wherein if the UE doesnot find the C-RNTI value, or the C-RNTI value is set as a preset value(for example, all 0, or all 1, or a specified value), the UE directlysets the TC-RNTI as a C-RNTI; otherwise the UE sets the read allocatedC-RNTI value as its own C-RNTI; and/or,

The uplink resource configuration information used for transmitting thefeedback information (ACK) of the message 4, i.e., the HARQ feedbackresource indication, and the HARQ feedback resource indication includesthe uplink resource configuration information; wherein the configurationinformation of the uplink resource should include at least one of thefollowing:

i. Time Position

1) The time position may be a specific time unit index, wherein the timeunit position may be, for example, symbol index, slot index, mini slotindex, symbol group index, subframe index, half subframe index, radioframe index;

2) The time position may also be a relative position relative to a knowntime unit position, such as M time unit positions subsequent to the timeunit position where the common search space is located; or M time unitpositions subsequent to the time unit position where message 4 islocated.

ii. Frequency Domain Position

1) The frequency domain position may be a specific frequency domain unitindex position, wherein the frequency domain unit position may be, forexample, a subcarrier index, a subcarrier group index, a physicalresource block index (PRB index), a physical resource block group index,and the like;

2). The frequency domain position may also be a relative positionrelative to a known frequency-domain unit position, such as Mfrequency-domain unit positions relative to a frequency-domain unitposition where the common search space is located; or M frequency-domainunit positions relative to the frequency-domain unit position wheremessage 4 is located;

iii. Sequence Information

The sequence information may be sequence index information used by theUE to generate a PUCCH.

It should be noted that if time position information and/or frequencydomain position information and/or sequence information have beenconfigured in a broadcast message or other downlink channel (as inmessage 2), in message 4, only the rest of information need to beconfigured, for example, the uplink time unit position and the frequencydomain unit position for transmitting feedback have been configured inthe system broadcast information.

b) If the comparison is negative, the UE continues to compare otherpositions in the MAC CE that contain the UE contention resolutionidentity. As shown in FIG. 31, the UE may correctly match with the UEcontention resolution identity 2, and its subsequent processing processas mentioned above, and will not be repeated here.

c) Until the UE searches for all UE contention resolution identifies,there are no correctly matched UE contention resolution identity, andthe maximum transmission times of preamble hasn't been exceeded by theUE, then the UE retransmits message 1.

2. When the MAC PDU decoded by the UE includes the MAC CE for indicatingthe UE contention resolution identity and the MAC CE for indicating theallocated C-RNTI and HARQ feedback resource indication, the UE willcompare the UE contention resolution identity (N bits, such as 48 bitsin LTE) in the MAC CE with the first N bits (or the last N bits, or theN bits of the specified position) in the CCCH SDU uploaded in message 3by the UE, as shown in FIG. 32.

a) If the comparison is positive, the UE may consider its own contentionresolution to be successful and continue to read the C-RNTI value asassigned by the base station in the MAC CE indicating the allocatedC-RNTI and HARQ feedback resource indication; wherein if the UE does notfind the C-RNTI value, or the C-RNTI value is set as a preset value (forexample, all 0, or all 1, or a specified value), the UE directly setsthe TC-RNTI as a C-RNTI; otherwise the UE sets the read allocated C-RNTIvalue as its own C-RNTI; and/or,

The uplink resource configuration information used for transmitting thefeedback information (ACK) of the message 4, i.e., the HARQ feedbackresource indication, and the HARQ feedback resource indication includesthe uplink resource configuration information; wherein the configurationinformation of the uplink resource should include at least one of thefollowing types:

i. Time Position

1) The time position may be a specific time unit index, wherein the timeunit position may be, for example, symbol index, slot index, mini slotindex, symbol group index, subframe index, half subframe index, radioframe index;

2) The time position may also be a relative position relative to a knowntime unit position, such as M time unit positions subsequent to the timeunit position where the common search space is located; or M time unitpositions subsequent to the time unit position where message 4 islocated.

ii. Frequency Domain Position

1) The frequency domain position may be a specific frequency domain unitindex position, wherein the frequency domain unit position may be, forexample, a subcarrier index, a subcarrier group index, a physicalresource block index (PRB index), a physical resource block group index,and the like;

2) The frequency domain position may also be a relative positionrelative to a known frequency-domain unit position, such as Mfrequency-domain unit positions relative to a frequency-domain unitposition where the common search space is located; or M frequency-domainunit positions relative to the frequency-domain unit position wheremessage 4 is located;

iii. Sequence Information

The sequence information may be sequence index information used by theUE to generate a PUCCH.

It should be noted that if time position information and/or frequencydomain position information and/or sequence information have beenconfigured in a broadcast message or other downlink channel (as inmessage 2), in message 4, only the rest of information need to beconfigured, for example, the uplink time unit position and the frequencydomain unit position for transmitting feedback have been configured inthe system broadcast information.

b) If the comparison is negative, the UE continues to compare otherpositions in the MAC CE that contain the UE contention resolutionidentity. As shown in FIG. 33, the UE may correctly match with the UEcontention resolution identity 2, and its subsequent processing processas mentioned above, and will not be repeated here.

c) Until the UE searches for all UE contention resolution identifies,there are no correctly matched UE contention resolution identity, andthe maximum transmission times of preamble by the UE hasn't beenexceeded, then the UE retransmits message 1.

3. When the MAC PDU decoded by the UE includes the MAC CE for indicatingthe UE contention resolution identity and the MAC CE for indicating theallocated C-RNTI and HARQ feedback resource indication, as theabove-mentioned method, the UE will firstly compare the UE contentionresolution identities in the MAC CE. If the comparison is successful,the UE then obtains allocated C-RNTI and/or HARQ feedback resourceindication from the MAC SDU. In this case, the MAC SDU may betransmitted to the RRC layer first, after the MAC SDU is decoded by theRRC layer, the allocated C-RNTI and/or HARQ feedback resource indicationare transmitted to the MAC layer; the other operation processes of themethod are the same as the above two manners, and will not be repeatedhere. Of course, the method may also be extended to a case wheremultiple CE contention resolution identities are included in the MAC CE.

Specifically, the above-described several forms of the uplink resourceconfiguration information for transmitting the feedback information(ACK) of the message 4 are not only applied to the transmission of thefeedback information of the message 4, but also can be applied to:

The UE may also use the uplink control channel resource configurationinformation configured in the message 4 to determine the uplinkresources for transmitting feedback information (ACK/NACK,acknowledgement and non-acknowledgement) of other received downlinksignals (such as PDCCH or PDSCH) before obtaining dedicated configurateduplink resources.

For example, in the message 4, when the uplink resource for the ACK istransmitted is configured to be the Kth time unit after receiving themessage 4, then before obtaining the dedicated configurated uplinkresource, when the uplink resources for the feedback information(ACK/NACK, acknowledgement and non-acknowledgement) of other receiveddownlink signals (for example, the PDCCH) is transmitted is also the Kthtime unit after receiving the downlink signal,

One or more types of uplink resource configuration information includedin other uplink resource configuration information for transmitting thefeedback information (ACK) of the message 4 may also be used.

Even when the UE is in a connected state and obtains the dedicateduplink resource configuration information, it can specify a downlinksignal that is scheduled in a common control channel (or common controlresource set) or a UE-group control channel (or UE-group controlresource set), and it can also use the uplink control channel resourceinformation configured in the message 4 to determine the uplink resourceused for transmitting feedback information (ACK/NACK, acknowledgementand non-acknowledgement) of other received downlink signals (such asPDCCH).

For example, in message 4, when the uplink resource for the ACK istransmitted is configured to be the Kth time unit after receiving themessage 4, and when the uplink resources for feedback information of thedownlink signal (PDSCH) scheduled in the common control channel and/orUE-group control channel is transmitted is also the Kth time unit afterreceiving the downlink signal (PDSCH).

One or more types of uplink resource configuration information includedin other uplink resource configuration information for transmitting thefeedback information (ACK) of the message 4 may also be used.

It should be noted that, the foregoing descriptions are merely preferredembodiments and are not intended to limit the present application. Anymodification, equivalent replacement, or improvement made within thespirit and principle of the present application should be includedwithin the protection scope of the application.

An Embodiment 8 of the present disclosure provides a base stationdevice, the specific structure is as shown in FIG. 34, including: afirst transmitting module 3402, a first receiving module 3404 and asecond transmitting module 3406;

The first transmitting module 3402 is configured to transmit randomaccess response(s) to a plurality of UEs based on the received preamblestransmitted by the plurality of UEs.

The first receiving module 3404 is configured to receive Msg3(s)transmitted by the plurality of UEs.

The second transmitting module 3406 is configured to transmit acontention resolution message to the plurality of UEs based on thereceived Msg3 transmitted by the plurality of UEs.

The random access method provided by the embodiment of the presentdisclosure comprises: transmitting of RAR(s) to a plurality of UEs,based on received preambles transmitted by the plurality of UEs;receiving of Msg3(s) transmitted by the plurality of UEs, which providesnecessary guarantees for subsequent transmitting of a contentionresolution message to the plurality of UEs; and transmitting of acontention resolution message to the plurality of UEs, based on thereceived Msg3 transmitted by the plurality of UEs. The method can enablethe base station to transmit the contention resolution message to theplurality of different UEs at the same time. It provides a reliableguarantee for multiple users to access the base station and perform datatransmission at the same time based on the received contentionresolution message, and effectively avoids the situation that the basestation transmits the contention resolution message to only one user andonly one user is accessed thereto.

Embodiment 9 of the present disclosure provides a user equipment, and aspecific structure is as shown in FIG. 35, which includes: a thirdtransmitting module 3502 and a second receiving module 3504; and a thirdtransmitting module 3502 is configured to transmit a Msg3 to the basestation based on the received random access response corresponding totransmitted preamble;

the second receiving module 3504 is configured to receive a contentionresolution message from the base station corresponding to the Msg3.

In the embodiment of the present disclosure, a Msg3 is transmitted tothe base station, based on received RAR corresponding to a transmittedpreamble, which provides necessary guarantees for subsequent theplurality of UEs receiving of the contention resolution messagetransmitted by the base station; and the contention resolution messagecorresponding to Msg3 and transmitted by the base station is received.The method can enable the plurality of UEs receive the contentionresolution message transmitted by the base station at the same time. Itprovides a reliable guarantee for multiple users to access the basestation and perform data transmission at the same time based on thereceived contention resolution message, and effectively avoids thesituation that only one user can receive the contention resolutionmessage and access to the base station.

It should be understood by those skilled in the art that the presentdisclosure involves devices for It should be understood by those skilledin the art that the present disclosure involves apparatuses forperforming one or more of operations as described in the presentdisclosure. Those apparatuses may be specially designed and manufacturedas intended, or may include well known apparatuses in a general-purposecomputer. Those apparatuses have computer programs stored therein, whichare selectively activated or reconstructed. Such computer programs maybe stored in device (such as computer) readable media or in any type ofmedia suitable for storing electronic instructions and respectivelycoupled to a bus, the computer readable media include but are notlimited to any type of disks (including floppy disks, hard disks,optical disks, CD-ROM and magneto optical disks), ROM (Read-OnlyMemory), RAM (Random Access Memory), EPROM (Erasable ProgrammableRead-Only Memory), EEPROM (Electrically Erasable Programmable Read-OnlyMemory), flash memories, magnetic cards or optical line cards. That is,readable media include any media storing or transmitting information ina device (for example, computer) readable form.

It may be understood by those skilled in the art that computer programinstructions may be used to realize each block in structure diagramsand/or block diagrams and/or flowcharts as well as a combination ofblocks in the structure diagrams and/or block diagrams and/orflowcharts. It may be understood by those skilled in the art that thesecomputer program instructions may be provided to general purposecomputers, special purpose computers or other processors of programmabledata processing means to be implemented, so that solutions designated ina block or blocks of the structure diagrams and/or block diagrams and/orflow diagrams are performed by computers or other processors ofprogrammable data processing means.

It may be understood by those skilled in the art that the operations,methods, steps in the flows, measures and solutions already discussed inthe present disclosure may be alternated, changed, combined or deleted.Further, the operations, methods, other steps in the flows, measures andsolutions already discussed in the present disclosure may also bealternated, changed, rearranged, decomposed, combined or deleted.Further, prior arts having the operations, methods, the steps in theflows, measures and solutions already discussed in the presentdisclosure may also be alternated, changed, rearranged, decomposed,combined or deleted.

Those skilled in the art will understand that the appended drawings areonly schematic diagrams of a preferred embodiment, and the modules orflows in the appended drawings are not necessarily necessary for theimplementation of the present disclosure.

Those skilled in the art will understand that modules in the device inthe embodiment can be distributed in the device of the embodimentaccording to the description of the embodiment, and correspondingchanges can also be made in one or more apparatuses different from theembodiment. The modules of the above embodiments can be combined intoone module or further divided into multiple sub-modules.

The above-mentioned serial numbers of the present disclosure are fordescription only and do not represent the advantages and disadvantagesof the embodiments.

The above disclosure is only a few specific embodiments of the presentdisclosure, but the present disclosure is not limited thereto, and anychanges that can be imagined by those skilled in the art should fallwithin the scope of protection of the present disclosure.

The foregoing descriptions are merely preferred embodiments of thepresent disclosure. It should be noted that, for a person of ordinaryskilled in the art, various modifications and embellishments can be madewithout departing from the principle of the present disclosure. Suchmodifications and embellishments shall be regarded as falling into theprotection scope of the present disclosure.

Methods according to embodiments stated in claims and/or specificationsof the present disclosure may be implemented in hardware, software, or acombination of hardware and software.

When the methods are implemented by software, a computer-readablestorage medium for storing one or more programs (software modules) maybe provided. The one or more programs stored in the computer-readablestorage medium may be configured for execution by one or more processorswithin the electronic device. The at least one program may includeinstructions that cause the electronic device to perform the methodsaccording to various embodiments of the present disclosure as defined bythe appended claims and/or disclosed herein.

The programs (software modules or software) may be stored innon-volatile memories including a random access memory and a flashmemory, a read only memory (ROM), an electrically erasable programmableread only memory (EEPROM), a magnetic disc storage device, a compactdisc-ROM (CD-ROM), digital versatile discs (DVDs), or other type opticalstorage devices, or a magnetic cassette. Alternatively, any combinationof some or all of them may form a memory in which the program is stored.Further, a plurality of such memories may be included in the electronicdevice.

In addition, the programs may be stored in an attachable storage devicewhich is accessible through communication networks such as the Internet,Intranet, local area network (LAN), wide area network (WAN), and storagearea network (SAN), or a combination thereof. Such a storage device mayaccess the electronic device via an external port. Further, a separatestorage device on the communication network may access a portableelectronic device.

In the above-described detailed embodiments of the present disclosure, acomponent included in the present disclosure is expressed in thesingular or the plural according to a presented detailed embodiment.However, the singular form or plural form is selected for convenience ofdescription suitable for the presented situation, and variousembodiments of the present disclosure are not limited to a singleelement or multiple elements thereof. Further, either multiple elementsexpressed in the description may be configured into a single element ora single element in the description may be configured into multipleelements.

While the present disclosure has been shown and described with referenceto certain embodiments thereof, it will be understood by those skilledin the art that various changes in form and details may be made thereinwithout departing from the scope of the present disclosure. Therefore,the scope of the present disclosure should not be defined as beinglimited to the embodiments, but should be defined by the appended claimsand equivalents thereof.

Although the present disclosure has been described with an exemplaryembodiment, various changes and modifications may be suggested to oneskilled in the art. It is intended that the present disclosure encompasssuch changes and modifications as fall within the scope of the appendedclaims.

What is claimed is:
 1. A method performed by a user equipment (UE) in awireless communication system, the method comprising: receiving, from abase station, system information including first information on a numberof physical random access channel (PRACH) transmission occasions, andsecond information on a frequency offset for a lowest PRACH transmissionoccasion in a frequency domain with respect to a physical resource block(PRB) 0 of an initial uplink bandwidth part (UL BWP); selecting a PRACHtransmission occasion of the PRACH transmission occasions; selecting arandom access preamble from a group of random access preambles; andtransmitting, to the base station, the random access preamble based onthe PRACH transmission occasion, wherein, in case that the PRACHtransmission occasion is associated with multiple synchronization signalblocks, a synchronization signal block of the multiple synchronizationsignal blocks is associated with the group of random access preambles.2. The method of claim 1, wherein the system information furtherincludes third information related to a lowest numbered resource blockof the initial UL BWP.
 3. The method of claim 1, wherein a number ofresource blocks occupied by the PRACH transmission occasion is obtainedbased on the second information, and wherein the random access preambleis transmitted based on the number of resource blocks occupied by thePRACH transmission occasion.
 4. The method of claim 1, wherein the PRACHtransmission occasions comprises PRACH transmission occasions that areconsecutive in a frequency domain, and wherein the lowest PRACHtransmission occasions correspond to a lowest index of the PRACHtransmission occasions.
 5. The method of claim 1, wherein the multiplesynchronization signal blocks are identified based on a reference signalreceived power (RSRP).
 6. A method performed by a base station in awireless communication system, the method comprising: transmitting, to auser equipment (UE), system information including first information on anumber of physical random access channel (PRACH) transmission occasions,and second information on a frequency offset for a lowest physicalrandom access channel (PRACH) transmission occasion in a frequencydomain with respect to a physical resource block (PRB) 0 of an initialuplink bandwidth part (UL BWP); and receiving, from the UE, a randomaccess preamble on the PRACH transmission occasion, wherein, in casethat the PRACH transmission occasion is associated with multiplesynchronization signal blocks, a synchronization signal block of themultiple synchronization signal blocks is associated with a grouping ofrandom access preambles, wherein the random access preamble is selectedfrom the group of random access preambles, and wherein the PRACHtransmission occasion is selected from the PRACH transmission occasions.7. The method of claim 6, wherein the system information furtherincludes third information related to a lowest numbered resource blockof the initial UL BWP.
 8. The method of claim 6, wherein a number ofresource blocks occupied by the PRACH transmission occasion is obtainedbased on the second information, and wherein the random access preambleis transmitted based on the number of resource blocks occupied by thePRACH transmission occasion.
 9. The method of claim 6, wherein the PRACHtransmission occasions comprises PRACH transmission occasions that areconsecutive in a frequency domain, and wherein the lowest PRACHtransmission occasions correspond to a lowest index of the PRACHtransmission occasions.
 10. The method of claim 6, wherein the multiplesynchronization signal blocks are identified based on a reference signalreceived power (RSRP).
 11. A user equipment (UE) in a wirelesscommunication system, the UE comprising: at least one transceiver; andat least one processor configured to: receive, from a base station,system information including first information on a number of physicalrandom access channel (PRACH) transmission occasions, and secondinformation on a frequency offset for a lowest physical random accesschannel (PRACH) transmission occasion in a frequency domain with respectto a physical resource block (PRB) 0 of an initial uplink bandwidth part(UL BWP); select a PRACH transmission occasion of the PRACH transmissionoccasions; select a random access preamble from a group of random accesspreambles; and transmit, to the base station, the random access preamblebased on the PRACH transmission occasion, wherein, in case that thePRACH transmission occasion is associated with multiple synchronizationsignal blocks, a synchronization signal block of the multiplesynchronization signal blocks is associated with the group of randomaccess preambles.
 12. The UE of claim 11, wherein the system informationfurther includes third information related to a lowest numbered resourceblock of the initial UL BWP.
 13. The UE of claim 11, wherein a number ofresource blocks occupied by the PRACH transmission occasion is obtainedbased on the second information, and wherein the random access preambleis transmitted based on the number of resource blocks occupied by thePRACH transmission occasion.
 14. The UE of claim 11, wherein themultiple synchronization signal blocks are identified based on areference signal received power (RSRP).
 15. The UE of claim 11, whereinthe PRACH transmission occasions comprises PRACH transmission occasionsthat are consecutive in a frequency domain, and wherein the lowest PRACHtransmission occasions correspond to a lowest index of the PRACHtransmission occasions.
 16. A base station (BS) in a wirelesscommunication system, the BS comprising: at least one transceiver; andat least one processor configured to: transmit, to a user equipment(UE), system information including first information on a number ofphysical random access channel (PRACH) transmission occasions, andsecond information on a frequency offset for a lowest physical randomaccess channel (PRACH) transmission occasion in a frequency domain withrespect to a physical resource block (PRB) 0 of an initial uplinkbandwidth part (UL BWP); and receive, from the UE, a random accesspreamble on the PRACH transmission occasion, wherein, in case that thePRACH transmission occasion is associated with multiple synchronizationsignal blocks, a synchronization signal block of the multiplesynchronization signal blocks is associated with a group of randomaccess preambles, wherein the PRACH transmission occasion is selectedfrom the PRACH transmission occasions, and wherein the random accesspreamble is selected from the group of random access preambles.
 17. TheBS of claim 16, wherein the system information further includes thirdinformation related to a lowest numbered resource block of the initialUL BWP.
 18. The BS of claim 16, wherein a number of resource blocksoccupied by the PRACH transmission occasion is obtained based on thesecond information, and wherein the random access preamble istransmitted based on the number of resource blocks occupied by the PRACHtransmission occasion.
 19. The BS of claim 16, wherein the multiplesynchronization signal blocks are identified based on a reference signalreceived power (RSRP).
 20. The BS of claim 16, wherein the PRACHtransmission occasions comprises PRACH transmission occasions that areconsecutive in a frequency domain, and wherein the lowest PRACHtransmission occasions correspond to a lowest index of the PRACHtransmission occasions.